diff --git a/app/client/components/GridView.js b/app/client/components/GridView.js
index d5446d75..b7454b0f 100644
--- a/app/client/components/GridView.js
+++ b/app/client/components/GridView.js
@@ -316,6 +316,20 @@ GridView.gridCommands = {
     this._shiftSelect(-1, this.cellSelector.col.end, selector.ROW,
                       this.viewSection.viewFields().peekLength - 1);
   },
+  ctrlShiftDown: function () {
+    this._shiftSelectUntilContent(selector.COL, 1, this.cellSelector.row.end, this.getLastDataRowIndex());
+  },
+  ctrlShiftUp: function () {
+    this._shiftSelectUntilContent(selector.COL, -1, this.cellSelector.row.end, this.getLastDataRowIndex());
+  },
+  ctrlShiftRight: function () {
+    this._shiftSelectUntilContent(selector.ROW, 1, this.cellSelector.col.end,
+      this.viewSection.viewFields().peekLength - 1);
+  },
+  ctrlShiftLeft: function () {
+    this._shiftSelectUntilContent(selector.ROW, -1, this.cellSelector.col.end,
+      this.viewSection.viewFields().peekLength - 1);
+  },
   fillSelectionDown: function() { this.fillSelectionDown(); },
   selectAll: function() { this.selectAll(); },
 
@@ -403,6 +417,120 @@ GridView.prototype._shiftSelect = function(step, selectObs, exemptType, maxVal)
   selectObs(newVal);
 };
 
+GridView.prototype._shiftSelectUntilContent = function(type, direction, selectObs, maxVal) {
+  const selection = {
+    colStart: this.cellSelector.col.start(),
+    colEnd: this.cellSelector.col.end(),
+    rowStart: this.cellSelector.row.start(),
+    rowEnd: this.cellSelector.row.end(),
+  };
+
+  const steps = this._stepsToContent(type, direction, selection, maxVal);
+  if (steps > 0) { this._shiftSelect(direction * steps, selectObs, type, maxVal); }
+}
+
+GridView.prototype._stepsToContent = function (type, direction, selection, maxVal) {
+  const {colEnd: colEnd, rowEnd: rowEnd} = selection;
+  let selectionData;
+
+  const cursorCol = this.cursor.fieldIndex();
+  const cursorRow = this.cursor.rowIndex();
+
+  if (type === selector.ROW && direction > 0) {
+    if (colEnd + 1 > maxVal) { return 0; }
+
+    selectionData = this._selectionData({colStart: colEnd, colEnd: maxVal, rowStart: cursorRow, rowEnd: cursorRow});
+  } else if (type === selector.ROW && direction < 0) {
+    if (colEnd - 1 < 0) { return 0; }
+
+    selectionData = this._selectionData({colStart: 0, colEnd, rowStart: cursorRow, rowEnd: cursorRow});
+  } else if (type === selector.COL && direction > 0) {
+    if (rowEnd + 1 > maxVal) { return 0; }
+
+    selectionData = this._selectionData({colStart: cursorCol, colEnd: cursorCol, rowStart: rowEnd, rowEnd: maxVal});
+  } else if (type === selector.COL && direction < 0) {
+    if (rowEnd - 1 > maxVal) { return 0; }
+
+    selectionData = this._selectionData({colStart: cursorCol, colEnd: cursorCol, rowStart: 0, rowEnd});
+  }
+
+  const {fields, rowIndices} = selectionData;
+  if (type === selector.ROW && direction < 0) {
+    // When moving selection left, we step through fields in reverse order.
+    fields.reverse();
+  }
+  if (type === selector.COL && direction < 0) {
+    // When moving selection up, we step through rows in reverse order.
+    rowIndices.reverse();
+  }
+
+  const colValuesByIndex = {};
+  for (const field of fields) {
+    const displayColId = field.displayColModel.peek().colId.peek();
+    colValuesByIndex[field._index()] = this.tableModel.tableData.getColValues(displayColId);
+  }
+
+  let steps = 0;
+
+  if (type === selector.ROW) {
+    const rowIndex = rowIndices[0];
+    const isLastColEmpty = this._isCellValueEmpty(colValuesByIndex[colEnd][rowIndex]);
+    const isNextColEmpty = this._isCellValueEmpty(colValuesByIndex[colEnd + direction][rowIndex]);
+    const shouldStopOnEmptyValue = !isLastColEmpty && !isNextColEmpty;
+    for (let i = 1; i < fields.length; i++) {
+      const hasEmptyValues = this._isCellValueEmpty(colValuesByIndex[fields[i]._index()][rowIndex]);
+      if (hasEmptyValues && shouldStopOnEmptyValue) {
+        return steps;
+      } else if (!hasEmptyValues && !shouldStopOnEmptyValue) {
+        return steps + 1;
+      }
+
+      steps += 1;
+    }
+  } else {
+    const colValues = colValuesByIndex[fields[0]._index()];
+    const isLastRowEmpty = this._isCellValueEmpty(colValues[rowIndices[0]]);
+    const isNextRowEmpty = this._isCellValueEmpty(colValues[rowIndices[1]]);
+    const shouldStopOnEmptyValue = !isLastRowEmpty && !isNextRowEmpty;
+    for (let i = 1; i < rowIndices.length; i++) {
+      const hasEmptyValues = this._isCellValueEmpty(colValues[rowIndices[i]]);
+      if (hasEmptyValues && shouldStopOnEmptyValue) {
+        return steps;
+      } else if (!hasEmptyValues && !shouldStopOnEmptyValue) {
+        return steps + 1;
+      }
+
+      steps += 1;
+    }
+  }
+
+  return steps;
+}
+
+GridView.prototype._selectionData = function({colStart, colEnd, rowStart, rowEnd}) {
+  const fields = [];
+  for (let i = colStart; i <= colEnd; i++) {
+    const field = this.viewSection.viewFields().at(i);
+    if (!field) { continue; }
+
+    fields.push(field);
+  }
+
+  const rowIndices = [];
+  for (let i = rowStart; i <= rowEnd; i++) {
+    const rowId = this.viewData.getRowId(i);
+    if (!rowId) { continue; }
+
+    rowIndices.push(this.tableModel.tableData.getRowIdIndex(rowId));
+  }
+
+  return {fields, rowIndices};
+}
+
+GridView.prototype._isCellValueEmpty = function(value) {
+  return value === null || value === undefined || value === '' || value === 'false';
+}
+
 /**
  * Pastes the provided data at the current cursor.
  *
@@ -532,15 +660,15 @@ GridView.prototype.fillSelectionDown = function() {
 
 
 /**
- * Returns a GridSelection of the selected rows and cols
+ * Returns a CopySelection of the selected rows and cols
  * @returns {Object} CopySelection
  */
 GridView.prototype.getSelection = function() {
-  var rowIds = [], fields = [], rowStyle = {}, colStyle = {};
-  var colStart = this.cellSelector.colLower();
-  var colEnd = this.cellSelector.colUpper();
-  var rowStart = this.cellSelector.rowLower();
-  var rowEnd = this.cellSelector.rowUpper();
+  let rowIds = [], fields = [], rowStyle = {}, colStyle = {};
+  let colStart = this.cellSelector.colLower();
+  let colEnd = this.cellSelector.colUpper();
+  let rowStart = this.cellSelector.rowLower();
+  let rowEnd = this.cellSelector.rowUpper();
 
   // If there is no selection, just copy/paste the cursor cell
   if (this.cellSelector.isCurrentSelectType(selector.NONE)) {
diff --git a/app/client/components/commandList.ts b/app/client/components/commandList.ts
index 65f03399..54a972df 100644
--- a/app/client/components/commandList.ts
+++ b/app/client/components/commandList.ts
@@ -50,6 +50,10 @@ export type CommandName =
   | 'shiftUp'
   | 'shiftRight'
   | 'shiftLeft'
+  | 'ctrlShiftDown'
+  | 'ctrlShiftUp'
+  | 'ctrlShiftRight'
+  | 'ctrlShiftLeft'
   | 'selectAll'
   | 'copyLink'
   | 'editField'
@@ -373,6 +377,22 @@ export const groups: CommendGroupDef[] = [{
      name: 'shiftLeft',
      keys: ['Shift+Left'],
      desc: 'Adds the element to the left of the cursor to the selected range'
+    }, {
+      name: 'ctrlShiftDown',
+      keys: ['Mod+Shift+Down'],
+      desc: 'Adds all elements below the cursor to the selected range'
+    }, {
+      name: 'ctrlShiftUp',
+      keys: ['Mod+Shift+Up'],
+      desc: 'Adds all elements above the cursor to the selected range'
+    }, {
+      name: 'ctrlShiftRight',
+      keys: ['Mod+Shift+Right'],
+      desc: 'Adds all elements to the right of the cursor to the selected range'
+    }, {
+      name: 'ctrlShiftLeft',
+      keys: ['Mod+Shift+Left'],
+      desc: 'Adds all elements to the left of the cursor to the selected range'
     }, {
       name: 'selectAll',
       keys: ['Mod+A'],
diff --git a/app/plugin/DocApiTypes-ti.ts b/app/plugin/DocApiTypes-ti.ts
index 0f6c26dc..366eb22f 100644
--- a/app/plugin/DocApiTypes-ti.ts
+++ b/app/plugin/DocApiTypes-ti.ts
@@ -68,6 +68,10 @@ export const ColumnsPatch = t.iface([], {
   "columns": t.tuple("RecordWithStringId", t.rest(t.array("RecordWithStringId"))),
 });
 
+export const ColumnsPut = t.iface([], {
+  "columns": t.tuple("RecordWithStringId", t.rest(t.array("RecordWithStringId"))),
+});
+
 export const TablePost = t.iface(["ColumnsPost"], {
   "id": t.opt("string"),
 });
@@ -93,6 +97,7 @@ const exportedTypeSuite: t.ITypeSuite = {
   MinimalRecord,
   ColumnsPost,
   ColumnsPatch,
+  ColumnsPut,
   TablePost,
   TablesPost,
   TablesPatch,
diff --git a/app/plugin/DocApiTypes.ts b/app/plugin/DocApiTypes.ts
index 8f9fc049..998b635b 100644
--- a/app/plugin/DocApiTypes.ts
+++ b/app/plugin/DocApiTypes.ts
@@ -88,6 +88,10 @@ export interface ColumnsPatch {
   columns: [RecordWithStringId, ...RecordWithStringId[]]; // at least one column is required
 }
 
+export interface ColumnsPut {
+  columns: [RecordWithStringId, ...RecordWithStringId[]]; // at least one column is required
+}
+
 /**
  * Creating tables requires a list of columns.
  * `fields` is not accepted because it's not generally sensible to set the metadata fields on new tables.
diff --git a/app/server/lib/DocApi.ts b/app/server/lib/DocApi.ts
index f49773e5..33cc558c 100644
--- a/app/server/lib/DocApi.ts
+++ b/app/server/lib/DocApi.ts
@@ -2,7 +2,14 @@ import {concatenateSummaries, summarizeAction} from "app/common/ActionSummarizer
 import {createEmptyActionSummary} from "app/common/ActionSummary";
 import {ApiError, LimitType} from 'app/common/ApiError';
 import {BrowserSettings} from "app/common/BrowserSettings";
-import {BulkColValues, ColValues, fromTableDataAction, TableColValues, TableRecordValue} from 'app/common/DocActions';
+import {
+  BulkColValues,
+  ColValues,
+  fromTableDataAction,
+  TableColValues,
+  TableRecordValue,
+  UserAction
+} from 'app/common/DocActions';
 import {isRaisedException} from "app/common/gristTypes";
 import {buildUrlId, parseUrlId} from "app/common/gristUrls";
 import {isAffirmative} from "app/common/gutil";
@@ -94,7 +101,7 @@ type WithDocHandler = (activeDoc: ActiveDoc, req: RequestWithLogin, resp: Respon
 // Schema validators for api endpoints that creates or updates records.
 const {
   RecordsPatch, RecordsPost, RecordsPut,
-  ColumnsPost, ColumnsPatch,
+  ColumnsPost, ColumnsPatch, ColumnsPut,
   TablesPost, TablesPatch,
 } = t.createCheckers(DocApiTypesTI, GristDataTI);
 
@@ -194,16 +201,23 @@ export class DocWorkerApi {
     }
 
     async function getTableRecords(
-      activeDoc: ActiveDoc, req: RequestWithLogin, optTableId?: string
+      activeDoc: ActiveDoc, req: RequestWithLogin, opts?: { optTableId?: string; includeHidden?: boolean }
     ): Promise<TableRecordValue[]> {
-      const columnData = await getTableData(activeDoc, req, optTableId);
-      const fieldNames = Object.keys(columnData)
-        .filter(k => !(
-          ["id", "manualSort"].includes(k)
-          || k.startsWith("gristHelper_")
-        ));
+      const columnData = await getTableData(activeDoc, req, opts?.optTableId);
+      const fieldNames = Object.keys(columnData).filter((k) => {
+        if (k === "id") {
+          return false;
+        }
+        if (
+          !opts?.includeHidden &&
+          (k === "manualSort" || k.startsWith("gristHelper_"))
+        ) {
+          return false;
+        }
+        return true;
+      });
       return columnData.id.map((id, index) => {
-        const result: TableRecordValue = {id, fields: {}};
+        const result: TableRecordValue = { id, fields: {} };
         for (const key of fieldNames) {
           let value = columnData[key][index];
           if (isRaisedException(value)) {
@@ -226,7 +240,9 @@ export class DocWorkerApi {
     // Get the specified table in record-oriented format
     this._app.get('/api/docs/:docId/tables/:tableId/records', canView,
       withDoc(async (activeDoc, req, res) => {
-        const records = await getTableRecords(activeDoc, req);
+        const records = await getTableRecords(activeDoc, req,
+          { includeHidden: isAffirmative(req.query.hidden) }
+        );
         res.json({records});
       })
     );
@@ -357,8 +373,9 @@ export class DocWorkerApi {
     this._app.get('/api/docs/:docId/tables/:tableId/columns', canView,
       withDoc(async (activeDoc, req, res) => {
         const tableId = req.params.tableId;
+        const includeHidden = isAffirmative(req.query.hidden);
         const columns = await handleSandboxError('', [],
-          activeDoc.getTableCols(docSessionFromRequest(req), tableId));
+          activeDoc.getTableCols(docSessionFromRequest(req), tableId, includeHidden));
         res.json({columns});
       })
     );
@@ -366,7 +383,7 @@ export class DocWorkerApi {
     // Get the tables of the specified document in recordish format
     this._app.get('/api/docs/:docId/tables', canView,
       withDoc(async (activeDoc, req, res) => {
-        const records = await getTableRecords(activeDoc, req, "_grist_Tables");
+        const records = await getTableRecords(activeDoc, req, { optTableId: "_grist_Tables" });
         const tables = records.map((record) => ({
           id: record.fields.tableId,
           fields: {
@@ -395,7 +412,7 @@ export class DocWorkerApi {
 
     // Returns cleaned metadata for all attachments in /records format.
     this._app.get('/api/docs/:docId/attachments', canView, withDoc(async (activeDoc, req, res) => {
-      const rawRecords = await getTableRecords(activeDoc, req, "_grist_Attachments");
+      const rawRecords = await getTableRecords(activeDoc, req, { optTableId: "_grist_Attachments" });
       const records = rawRecords.map(r => ({
         id: r.id,
         fields: cleanAttachmentRecord(r.fields as MetaRowRecord<"_grist_Attachments">),
@@ -681,6 +698,54 @@ export class DocWorkerApi {
       })
     );
 
+    // Add or update records given in records format
+    this._app.put('/api/docs/:docId/tables/:tableId/columns', canEdit, validate(ColumnsPut),
+      withDoc(async (activeDoc, req, res) => {
+        const tablesTable = activeDoc.docData!.getMetaTable("_grist_Tables");
+        const columnsTable = activeDoc.docData!.getMetaTable("_grist_Tables_column");
+        const {tableId} = req.params;
+        const tableRef = tablesTable.findMatchingRowId({tableId});
+        if (!tableRef) {
+          throw new ApiError(`Table not found "${tableId}"`, 404);
+        }
+        const body = req.body as Types.ColumnsPut;
+
+        const addActions: UserAction[] = [];
+        const updateActions: UserAction[] = [];
+        const updatedColumnsIds = new Set();
+
+        for (const col of body.columns) {
+          const id = columnsTable.findMatchingRowId({parentId: tableRef, colId: col.id});
+          if (id) {
+            updateActions.push( ['UpdateRecord', '_grist_Tables_column', id, col.fields] );
+            updatedColumnsIds.add( id );
+          } else {
+            addActions.push( ['AddVisibleColumn', tableId, col.id, col.fields] );
+          }
+        }
+
+        const getRemoveAction = async () => {
+          const columns = await handleSandboxError('', [],
+            activeDoc.getTableCols(docSessionFromRequest(req), tableId));
+          const columnsToRemove = columns
+            .map(col => col.fields.colRef as number)
+            .filter(colRef => !updatedColumnsIds.has(colRef));
+
+          return [ 'BulkRemoveRecord', '_grist_Tables_column', columnsToRemove ];
+        };
+
+        const actions = [
+          ...(!isAffirmative(req.query.noupdate) ? updateActions : []),
+          ...(!isAffirmative(req.query.noadd) ? addActions : []),
+          ...(isAffirmative(req.query.replaceall) ? [ await getRemoveAction() ] : [] )
+        ];
+        await handleSandboxError(tableId, [],
+          activeDoc.applyUserActions(docSessionFromRequest(req), actions)
+        );
+        res.json(null);
+      })
+    );
+
     // Add a new webhook and trigger
     this._app.post('/api/docs/:docId/webhooks', isOwner, validate(WebhookSubscribeCollection),
       withDoc(async (activeDoc, req, res) => {
diff --git a/static/locales/de.client.json b/static/locales/de.client.json
index 89dc570b..6e21356d 100644
--- a/static/locales/de.client.json
+++ b/static/locales/de.client.json
@@ -483,7 +483,18 @@
         "{{count}} unmatched field in import_other": "{{count}} unangepasste Felder im Import",
         "{{count}} unmatched field_one": "{{count}} unangepasstes Feld",
         "{{count}} unmatched field_other": "{{count}} unangepasste Felder",
-        "{{count}} unmatched field in import_one": "{{count}} unangepasst Feld im Import"
+        "{{count}} unmatched field in import_one": "{{count}} unangepasst Feld im Import",
+        "Column mapping": "Spaltenzuordnung",
+        "Column Mapping": "Spaltenzuordnung",
+        "Destination table": "Zieltabelle",
+        "Grist column": "Grist Spalte",
+        "Import from file": "Aus Datei importieren",
+        "New Table": "Neue Tabelle",
+        "Revert": "Zurücksetzen",
+        "Skip": "überspringen",
+        "Skip Import": "Import überspringen",
+        "Skip Table on Import": "Tabelle beim Import überspringen",
+        "Source column": "Quellenspalte"
     },
     "LeftPanelCommon": {
         "Help Center": "Hilfe-Center"
@@ -904,7 +915,10 @@
         "Open row styles": "Zeilenstile öffnen",
         "Cell Style": "Zellenstil",
         "Default cell style": "Standard-Zellenstil",
-        "Mixed style": "Gemischter Stil"
+        "Mixed style": "Gemischter Stil",
+        "Default header style": "Standard Kopfzeilenstil",
+        "Header Style": "Kopfzeilenstil",
+        "HEADER STYLE": "KOPFSTIL"
     },
     "DiscussionEditor": {
         "Resolve": "Beschließen",
@@ -1127,7 +1141,8 @@
         "Sign Up for Free": "Melden Sie sich kostenlos an",
         "Sign up for a free Grist account to start using the Formula AI Assistant.": "Melden Sie sich für ein kostenloses Grist-Konto an, um den KI Formel Assistenten zu verwenden.",
         "There are some things you should know when working with me:": "Es gibt einige Dinge, die Sie wissen sollten, wenn Sie mit mir arbeiten:",
-        "What do you need help with?": "Womit brauchen Sie Hilfe?"
+        "What do you need help with?": "Womit brauchen Sie Hilfe?",
+        "Formula AI Assistant is only available for logged in users.": "Der Formel-KI-Assistent ist nur für eingeloggte Benutzer verfügbar."
     },
     "GridView": {
         "Click to insert": "Zum Einfügen klicken"
diff --git a/static/locales/en.client.json b/static/locales/en.client.json
index 99924f77..893cbda5 100644
--- a/static/locales/en.client.json
+++ b/static/locales/en.client.json
@@ -853,7 +853,8 @@
         "Mixed style": "Mixed style",
         "Open row styles": "Open row styles",
         "Default header style": "Default header style",
-        "Header Style": "Header Style"
+        "Header Style": "Header Style",
+        "HEADER STYLE": "HEADER STYLE"
     },
     "ChoiceTextBox": {
         "CHOICES": "CHOICES"
@@ -1076,7 +1077,8 @@
         "Sign Up for Free": "Sign Up for Free",
         "Sign up for a free Grist account to start using the Formula AI Assistant.": "Sign up for a free Grist account to start using the Formula AI Assistant.",
         "There are some things you should know when working with me:": "There are some things you should know when working with me:",
-        "What do you need help with?": "What do you need help with?"
+        "What do you need help with?": "What do you need help with?",
+        "Formula AI Assistant is only available for logged in users.": "Formula AI Assistant is only available for logged in users."
     },
     "GridView": {
         "Click to insert": "Click to insert"
diff --git a/static/locales/es.client.json b/static/locales/es.client.json
index 466ba0ff..4d11ebde 100644
--- a/static/locales/es.client.json
+++ b/static/locales/es.client.json
@@ -776,7 +776,7 @@
         "Unmark On-Demand": "Desmarcar bajo demanda"
     },
     "FilterBar": {
-        "SearchColumns": "Buscar columnas",
+        "SearchColumns": "Buscar en columnas",
         "Search Columns": "Buscar columnas"
     },
     "Importer": {
@@ -786,7 +786,18 @@
         "{{count}} unmatched field in import_one": "{{count}} campo no coincide con la importación",
         "{{count}} unmatched field_one": "{{count}} campo sin equivalente",
         "{{count}} unmatched field_other": "{{count}} campos sin equivalentes",
-        "{{count}} unmatched field in import_other": "{{count}} campos sin equivalente en la importación"
+        "{{count}} unmatched field in import_other": "{{count}} campos sin equivalente en la importación",
+        "Column Mapping": "Asignación de columnas",
+        "Column mapping": "Asignación de las columnas",
+        "Import from file": "Importar desde un archivo",
+        "New Table": "Tabla nueva",
+        "Revert": "Revertir",
+        "Skip": "Omitir",
+        "Skip Import": "Omitir la importación",
+        "Source column": "Columna de origen",
+        "Destination table": "Tabla de destino",
+        "Grist column": "Columna Grist",
+        "Skip Table on Import": "Omitir la tabla en la importación"
     },
     "PermissionsWidget": {
         "Allow All": "Permitir todo",
@@ -894,7 +905,10 @@
         "Default cell style": "Estilo de celda predeterminado",
         "CELL STYLE": "ESTILO DE CELDA",
         "Open row styles": "Abrir estilos de fila",
-        "Mixed style": "Estilo mixto"
+        "Mixed style": "Estilo mixto",
+        "Header Style": "Estilo del encabezado",
+        "Default header style": "Estilo del encabezado por defecto",
+        "HEADER STYLE": "ESTILO DEL ENCABEZADO"
     },
     "ColumnInfo": {
         "Cancel": "Cancelar",
@@ -1117,7 +1131,8 @@
         "Hi, I'm the Grist Formula AI Assistant.": "Hola, soy el Asistente de IA de Fórmula Grist.",
         "I can only help with formulas. I cannot build tables, columns, and views, or write access rules.": "Sólo puedo ayudar con fórmulas. No puedo construir tablas, columnas y vistas, ni escribir reglas de acceso.",
         "Sign Up for Free": "Regístrate gratis",
-        "There are some things you should know when working with me:": "Hay algunas cosas que debes saber cuando trabajes conmigo:"
+        "There are some things you should know when working with me:": "Hay algunas cosas que debes saber cuando trabajes conmigo:",
+        "Formula AI Assistant is only available for logged in users.": "Formula AI Assistant sólo está disponible para usuarios registrados."
     },
     "GridView": {
         "Click to insert": "Haga clic para insertar"
diff --git a/static/locales/pt_BR.client.json b/static/locales/pt_BR.client.json
index d6ba906f..aee8d1f1 100644
--- a/static/locales/pt_BR.client.json
+++ b/static/locales/pt_BR.client.json
@@ -483,7 +483,18 @@
         "{{count}} unmatched field_other": "{{count}} campos sem equivalente",
         "{{count}} unmatched field in import_other": "{{count}} campos sem equivalente na importação",
         "{{count}} unmatched field in import_one": "{{count}} campo sem equivalente na importação",
-        "{{count}} unmatched field_one": "{{count}} campo sem equivalente"
+        "{{count}} unmatched field_one": "{{count}} campo sem equivalente",
+        "Column Mapping": "Mapeamento de coluna",
+        "Column mapping": "Mapeamento de coluna",
+        "Destination table": "Tabela de destino",
+        "Grist column": "Coluna de Grist",
+        "New Table": "Nova tabela",
+        "Revert": "Reverter",
+        "Skip": "Pular",
+        "Skip Import": "Pular importação",
+        "Source column": "Coluna de origem",
+        "Import from file": "Importar de arquivo",
+        "Skip Table on Import": "Pular tabela na importação"
     },
     "LeftPanelCommon": {
         "Help Center": "Centro de Ajuda"
@@ -996,7 +1007,10 @@
         "Cell Style": "Estilo de célula",
         "Default cell style": "Estilo de célula padrão",
         "Mixed style": "Estilo misto",
-        "Open row styles": "Estilos de linha aberta"
+        "Open row styles": "Estilos de linha aberta",
+        "Default header style": "Estilo de cabeçalho padrão",
+        "Header Style": "Estilo de cabeçalho",
+        "HEADER STYLE": "ESTILO DE CABEÇALHO"
     },
     "ColumnEditor": {
         "COLUMN DESCRIPTION": "DESCRIÇÃO DA COLUNA",
@@ -1127,7 +1141,8 @@
         "Sign up for a free Grist account to start using the Formula AI Assistant.": "Cadastre-se para uma conta gratuita do Grist para começar a usar o Assistente de Fórmula AI.",
         "What do you need help with?": "Em que você precisa de ajuda?",
         "There are some things you should know when working with me:": "Há algumas coisas que você deve saber ao trabalhar comigo:",
-        "Learn more": "Saiba mais"
+        "Learn more": "Saiba mais",
+        "Formula AI Assistant is only available for logged in users.": "O Assistente de Fórmula de IA só está disponível para usuários registrados."
     },
     "GridView": {
         "Click to insert": "Clique para inserir"
diff --git a/static/locales/ru.client.json b/static/locales/ru.client.json
index c6de2f37..f9ac25b4 100644
--- a/static/locales/ru.client.json
+++ b/static/locales/ru.client.json
@@ -549,7 +549,18 @@
         "{{count}} unmatched field in import_other": "{{count}} несовпадающие поля при импорте",
         "{{count}} unmatched field in import_one": "{{count}} несовпадающее поле при импорте",
         "{{count}} unmatched field_one": "{{count}} несовпадающее поле",
-        "{{count}} unmatched field_other": "{{count}} несовпадающие поля"
+        "{{count}} unmatched field_other": "{{count}} несовпадающие поля",
+        "Column Mapping": "Сопоставление столбцов",
+        "Column mapping": "Сопоставление столбцов",
+        "Destination table": "Таблица назначения",
+        "Grist column": "Grist столбец",
+        "Import from file": "Импорт из файла",
+        "New Table": "Новая таблица",
+        "Revert": "Восстановить",
+        "Skip": "Пропустить",
+        "Skip Table on Import": "Пропустить Таблицу при импорте",
+        "Source column": "Столбец Источника",
+        "Skip Import": "Пропустить импорт"
     },
     "LeftPanelCommon": {
         "Help Center": "Справочный центр"
@@ -757,7 +768,10 @@
         "Default cell style": "Стиль ячейки по умолчанию",
         "Open row styles": "Открыть форматы строк",
         "Cell Style": "Стиль ячейки",
-        "Mixed style": "Смешанный стиль"
+        "Mixed style": "Смешанный стиль",
+        "Default header style": "Стиль заголовка по умолчанию",
+        "HEADER STYLE": "СТИЛЬ ЗАГОЛОВКА",
+        "Header Style": "Стиль заголовка"
     },
     "TypeTransform": {
         "Cancel": "Отмена",
@@ -1063,7 +1077,8 @@
         "Sign up for a free Grist account to start using the Formula AI Assistant.": "Зарегистрируйте бесплатную учетную запись Grist, чтобы начать использовать AI Помощника по формулам.",
         "There are some things you should know when working with me:": "Есть некоторые вещи, которые вы должны знать, работая со мной:",
         "What do you need help with?": "Как я могу вам помочь?",
-        "Hi, I'm the Grist Formula AI Assistant.": "Привет, я AI Помощник по формулам Grist."
+        "Hi, I'm the Grist Formula AI Assistant.": "Привет, я AI Помощник по формулам Grist.",
+        "Formula AI Assistant is only available for logged in users.": "AI Ассистент для формул доступен только для зарегистрированных пользователей."
     },
     "GridView": {
         "Click to insert": "Нажмите для вставки"
diff --git a/test/fixtures/docs/ShiftSelection.grist b/test/fixtures/docs/ShiftSelection.grist
new file mode 100644
index 00000000..083021d4
Binary files /dev/null and b/test/fixtures/docs/ShiftSelection.grist differ
diff --git a/test/nbrowser/ShiftSelection.ts b/test/nbrowser/ShiftSelection.ts
new file mode 100644
index 00000000..48576418
--- /dev/null
+++ b/test/nbrowser/ShiftSelection.ts
@@ -0,0 +1,213 @@
+import {assert, driver, Key, WebElement} from 'mocha-webdriver';
+import * as gu from 'test/nbrowser/gristUtils';
+import {setupTestSuite} from 'test/nbrowser/testUtils';
+
+interface CellSelection {
+  /** 0-based column index. */
+  colStart: number;
+
+  /** 0-based column index. */
+  colEnd: number;
+
+  /** 0-based row index. */
+  rowStart: number;
+
+  /** 0-based row index. */
+  rowEnd: number;
+}
+
+interface SelectionRange {
+  /** 0-based index. */
+  start: number;
+
+  /** 0-based index. */
+  end: number;
+}
+
+describe('ShiftSelection', function () {
+  this.timeout(20000);
+  const cleanup = setupTestSuite();
+  gu.bigScreen();
+
+  before(async function() {
+    const session = await gu.session().personalSite.login();
+    await session.tempDoc(cleanup, 'ShiftSelection.grist');
+  });
+
+  async function getSelectionRange(parent: WebElement, selector: string): Promise<SelectionRange|undefined> {
+    let start, end;
+
+    let selectionActive = false;
+    const elements = await parent.findAll(selector);
+    for (let i = 0; i < elements.length; i++) {
+      const element = elements[i];
+      const isSelected = await element.matches('.selected');
+
+      if (isSelected && !selectionActive) {
+        start = i;
+        selectionActive = true;
+        continue;
+      }
+
+      if (!isSelected && selectionActive) {
+        end = i - 1;
+        break;
+      }
+    }
+
+    if (start === undefined) {
+      return undefined;
+    }
+
+    if (end === undefined) {
+      end = elements.length - 1;
+    }
+
+    return {
+      start: start,
+      end: end,
+    };
+  }
+
+  async function getSelectedCells(): Promise<CellSelection|undefined> {
+    const activeSection = await driver.find('.active_section');
+
+    const colSelection = await getSelectionRange(activeSection, '.column_names .column_name');
+    if (!colSelection) {
+      return undefined;
+    }
+
+    const rowSelection = await getSelectionRange(activeSection, '.gridview_row .gridview_data_row_num');
+    if (!rowSelection) {
+      // Edge case if only a cell in the "new" row is selected
+      // Not relevant for our tests
+      return undefined;
+    }
+
+    return {
+      colStart: colSelection.start,
+      colEnd: colSelection.end,
+      rowStart: rowSelection.start,
+      rowEnd: rowSelection.end,
+    };
+  }
+
+  async function assertCellSelection(expected: CellSelection|undefined) {
+    const currentSelection = await getSelectedCells();
+    assert.deepEqual(currentSelection, expected);
+  }
+
+
+  it('Shift+Up extends the selection up', async function () {
+    await gu.getCell(1, 2).click();
+    await gu.sendKeys(Key.chord(Key.SHIFT, Key.UP));
+    await assertCellSelection({colStart: 1, colEnd: 1, rowStart: 0, rowEnd: 1});
+  });
+
+  it('Shift+Down extends the selection down', async function () {
+    await gu.getCell(1, 2).click();
+    await gu.sendKeys(Key.chord(Key.SHIFT, Key.DOWN));
+    await assertCellSelection({colStart: 1, colEnd: 1, rowStart: 1, rowEnd: 2});
+  });
+
+  it('Shift+Left extends the selection left', async function () {
+    await gu.getCell(1, 2).click();
+    await gu.sendKeys(Key.chord(Key.SHIFT, Key.LEFT));
+    await assertCellSelection({colStart: 0, colEnd: 1, rowStart: 1, rowEnd: 1});
+  });
+
+  it('Shift+Right extends the selection right', async function () {
+    await gu.getCell(1, 2).click();
+    await gu.sendKeys(Key.chord(Key.SHIFT, Key.RIGHT));
+    await assertCellSelection({colStart: 1, colEnd: 2, rowStart: 1, rowEnd: 1});
+  });
+
+  it('Shift+Right + Shift+Left leads to the initial selection', async function () {
+    await gu.getCell(1, 2).click();
+    await gu.sendKeys(Key.chord(Key.SHIFT, Key.RIGHT));
+    await gu.sendKeys(Key.chord(Key.SHIFT, Key.LEFT));
+    await assertCellSelection({colStart: 1, colEnd: 1, rowStart: 1, rowEnd: 1});
+  });
+
+  it('Shift+Up + Shift+Down leads to the initial selection', async function () {
+    await gu.getCell(1, 2).click();
+    await gu.sendKeys(Key.chord(Key.SHIFT, Key.UP));
+    await gu.sendKeys(Key.chord(Key.SHIFT, Key.DOWN));
+    await assertCellSelection({colStart: 1, colEnd: 1, rowStart: 1, rowEnd: 1});
+  });
+
+  it('Ctrl+Shift+Up extends the selection blockwise up', async function () {
+    await gu.getCell(5, 7).click();
+
+    const ctrlKey = await gu.modKey();
+
+    await gu.sendKeys(Key.chord(ctrlKey, Key.SHIFT, Key.UP));
+    await assertCellSelection({colStart: 5, colEnd: 5, rowStart: 4, rowEnd: 6});
+
+    await gu.sendKeys(Key.chord(ctrlKey, Key.SHIFT, Key.UP));
+    await assertCellSelection({colStart: 5, colEnd: 5, rowStart: 2, rowEnd: 6});
+
+    await gu.sendKeys(Key.chord(ctrlKey, Key.SHIFT, Key.UP));
+    await assertCellSelection({colStart: 5, colEnd: 5, rowStart: 0, rowEnd: 6});
+  });
+
+  it('Ctrl+Shift+Down extends the selection blockwise down', async function () {
+    await gu.getCell(5, 5).click();
+
+    const ctrlKey = await gu.modKey();
+
+    await gu.sendKeys(Key.chord(ctrlKey, Key.SHIFT, Key.DOWN));
+    await assertCellSelection({colStart: 5, colEnd: 5, rowStart: 4, rowEnd: 6});
+
+    await gu.sendKeys(Key.chord(ctrlKey, Key.SHIFT, Key.DOWN));
+    await assertCellSelection({colStart: 5, colEnd: 5, rowStart: 4, rowEnd: 8});
+
+    await gu.sendKeys(Key.chord(ctrlKey, Key.SHIFT, Key.DOWN));
+    await assertCellSelection({colStart: 5, colEnd: 5, rowStart: 4, rowEnd: 10});
+  });
+
+  it('Ctrl+Shift+Left extends the selection blockwise left', async function () {
+    await gu.getCell(6, 5).click();
+
+    const ctrlKey = await gu.modKey();
+
+    await gu.sendKeys(Key.chord(ctrlKey, Key.SHIFT, Key.LEFT));
+    await assertCellSelection({colStart: 4, colEnd: 6, rowStart: 4, rowEnd: 4});
+
+    await gu.sendKeys(Key.chord(ctrlKey, Key.SHIFT, Key.LEFT));
+    await assertCellSelection({colStart: 2, colEnd: 6, rowStart: 4, rowEnd: 4});
+
+    await gu.sendKeys(Key.chord(ctrlKey, Key.SHIFT, Key.LEFT));
+    await assertCellSelection({colStart: 0, colEnd: 6, rowStart: 4, rowEnd: 4});
+  });
+
+  it('Ctrl+Shift+Right extends the selection blockwise right', async function () {
+    await gu.getCell(4, 5).click();
+
+    const ctrlKey = await gu.modKey();
+
+    await gu.sendKeys(Key.chord(ctrlKey, Key.SHIFT, Key.RIGHT));
+    await assertCellSelection({colStart: 4, colEnd: 6, rowStart: 4, rowEnd: 4});
+
+    await gu.sendKeys(Key.chord(ctrlKey, Key.SHIFT, Key.RIGHT));
+    await assertCellSelection({colStart: 4, colEnd: 8, rowStart: 4, rowEnd: 4});
+
+    await gu.sendKeys(Key.chord(ctrlKey, Key.SHIFT, Key.RIGHT));
+    await assertCellSelection({colStart: 4, colEnd: 10, rowStart: 4, rowEnd: 4});
+  });
+
+  it('Ctrl+Shift+* extends the selection until all the next cells are empty', async function () {
+    await gu.getCell(3, 7).click();
+
+    const ctrlKey = await gu.modKey();
+
+    await gu.sendKeys(Key.chord(Key.SHIFT, Key.RIGHT));
+    await gu.sendKeys(Key.chord(ctrlKey, Key.SHIFT, Key.UP));
+    await assertCellSelection({colStart: 3, colEnd: 4, rowStart: 2, rowEnd: 6});
+
+    await gu.getCell(4, 7).click();
+    await gu.sendKeys(Key.chord(Key.SHIFT, Key.LEFT));
+    await gu.sendKeys(Key.chord(ctrlKey, Key.SHIFT, Key.UP));
+    await assertCellSelection({colStart: 3, colEnd: 4, rowStart: 4, rowEnd: 6});
+  });
+ });
diff --git a/test/server/lib/DocApi.ts b/test/server/lib/DocApi.ts
index 768113f2..35348f13 100644
--- a/test/server/lib/DocApi.ts
+++ b/test/server/lib/DocApi.ts
@@ -5,7 +5,7 @@ import {arrayRepeat} from 'app/common/gutil';
 import {WebhookSummary} from 'app/common/Triggers';
 import {DocAPI, DocState, UserAPIImpl} from 'app/common/UserAPI';
 import {testDailyApiLimitFeatures} from 'app/gen-server/entity/Product';
-import {AddOrUpdateRecord, Record as ApiRecord} from 'app/plugin/DocApiTypes';
+import {AddOrUpdateRecord, Record as ApiRecord, ColumnsPut, RecordWithStringId} from 'app/plugin/DocApiTypes';
 import {CellValue, GristObjCode} from 'app/plugin/GristData';
 import {
   applyQueryParameters,
@@ -443,6 +443,26 @@ function testDocApi() {
       });
   });
 
+  it('GET /docs/{did}/tables/{tid}/records honors the "hidden" param', async function () {
+    const params = { hidden: true };
+    const resp = await axios.get(
+      `${serverUrl}/api/docs/${docIds.Timesheets}/tables/Table1/records`,
+      {...chimpy, params }
+    );
+    assert.equal(resp.status, 200);
+    assert.deepEqual(resp.data.records[0], {
+      id: 1,
+      fields: {
+        manualSort: 1,
+        A: 'hello',
+        B: '',
+        C: '',
+        D: null,
+        E: 'HELLO',
+      },
+    });
+  });
+
   it("GET /docs/{did}/tables/{tid}/records handles errors and hidden columns", async function () {
     let resp = await axios.get(`${serverUrl}/api/docs/${docIds.ApiDataRecordsTest}/tables/Table1/records`, chimpy);
     assert.equal(resp.status, 200);
@@ -610,6 +630,21 @@ function testDocApi() {
     );
   });
 
+  it('GET /docs/{did}/tables/{tid}/columns retrieves hidden columns when "hidden" is set', async function () {
+    const params = { hidden: true };
+    const resp = await axios.get(
+      `${serverUrl}/api/docs/${docIds.Timesheets}/tables/Table1/columns`,
+      { ...chimpy, params }
+    );
+    assert.equal(resp.status, 200);
+    const columnsMap = new Map(resp.data.columns.map(({id, fields}: {id: string, fields: object}) => [id, fields]));
+    assert.include([...columnsMap.keys()], "manualSort");
+    assert.deepInclude(columnsMap.get("manualSort"), {
+      colRef: 1,
+      type: 'ManualSortPos',
+    });
+  });
+
   it("GET/POST/PATCH /docs/{did}/tables and /columns", async function () {
     // POST /tables: Create new tables
     let resp = await axios.post(`${serverUrl}/api/docs/${docIds.Timesheets}/tables`, {
@@ -842,6 +877,126 @@ function testDocApi() {
     assert.equal(resp.status, 200);
   });
 
+  describe("PUT /docs/{did}/columns", function () {
+
+    async function generateDocAndUrl() {
+      const wid = (await userApi.getOrgWorkspaces('current')).find((w) => w.name === 'Private')!.id;
+      const docId = await userApi.newDoc({name: 'ColumnsPut'}, wid);
+      const url = `${serverUrl}/api/docs/${docId}/tables/Table1/columns`;
+      return { url, docId };
+    }
+
+    async function getColumnFieldsMapById(url: string, params: any) {
+      const result = await axios.get(url, {...chimpy, params});
+      assert.equal(result.status, 200);
+      return new Map<string, object>(
+          result.data.columns.map(
+            ({id, fields}: {id: string, fields: object}) => [id, fields]
+          )
+      );
+    }
+
+    async function checkPut(
+      columns: [RecordWithStringId, ...RecordWithStringId[]],
+      params: Record<string, any>,
+      expectedFieldsByColId: Record<string, object>,
+      opts?: { getParams?: any }
+    ) {
+      const {url} = await generateDocAndUrl();
+      const body: ColumnsPut = { columns };
+      const resp = await axios.put(url, body, {...chimpy, params});
+      assert.equal(resp.status, 200);
+      const fieldsByColId = await getColumnFieldsMapById(url, opts?.getParams);
+
+      assert.deepEqual(
+        [...fieldsByColId.keys()],
+        Object.keys(expectedFieldsByColId),
+        "The updated table should have the expected columns"
+      );
+
+      for (const [colId, expectedFields] of Object.entries(expectedFieldsByColId)) {
+        assert.deepInclude(fieldsByColId.get(colId), expectedFields);
+      }
+    }
+
+    const COLUMN_TO_ADD = {
+      id: "Foo",
+      fields: {
+        type: "Text",
+        label: "FooLabel",
+      }
+    };
+
+    const COLUMN_TO_UPDATE = {
+      id: "A",
+      fields: {
+        type: "Numeric",
+        colId: "NewA"
+      }
+    };
+
+    it('should create new columns', async function () {
+      await checkPut([COLUMN_TO_ADD], {}, {
+        A: {}, B: {}, C: {}, Foo: COLUMN_TO_ADD.fields
+      });
+    });
+
+    it('should update existing columns and create new ones', async function () {
+      await checkPut([COLUMN_TO_ADD, COLUMN_TO_UPDATE], {}, {
+        NewA: {type: "Numeric", label: "A"}, B: {}, C: {}, Foo: COLUMN_TO_ADD.fields
+      });
+    });
+
+    it('should only update existing columns when noadd is set', async function () {
+      await checkPut([COLUMN_TO_ADD, COLUMN_TO_UPDATE], {noadd: "1"}, {
+        NewA: {type: "Numeric"}, B: {}, C: {}
+      });
+    });
+
+    it('should only add columns when noupdate is set', async function () {
+      await checkPut([COLUMN_TO_ADD, COLUMN_TO_UPDATE], {noupdate: "1"}, {
+        A: {type: "Any"}, B: {}, C: {}, Foo: COLUMN_TO_ADD.fields
+      });
+    });
+
+    it('should remove existing columns if replaceall is set', async function () {
+      await checkPut([COLUMN_TO_ADD, COLUMN_TO_UPDATE], {replaceall: "1"}, {
+        NewA: {type: "Numeric"}, Foo: COLUMN_TO_ADD.fields
+      });
+    });
+
+    it('should NOT remove hidden columns even when replaceall is set', async function () {
+      await checkPut([COLUMN_TO_ADD, COLUMN_TO_UPDATE], {replaceall: "1"}, {
+        manualSort: {type: "ManualSortPos"}, NewA: {type: "Numeric"}, Foo: COLUMN_TO_ADD.fields
+      }, { getParams: { hidden: true } });
+    });
+
+    it('should forbid update by viewers', async function () {
+      // given
+      const { url, docId } = await generateDocAndUrl();
+      await userApi.updateDocPermissions(docId, {users: {'kiwi@getgrist.com': 'viewers'}});
+
+      // when
+      const resp = await axios.put(url, { columns: [ COLUMN_TO_ADD ] }, kiwi);
+
+      // then
+      assert.equal(resp.status, 403);
+    });
+
+    it("should return 404 when table is not found", async function() {
+      // given
+      const { url } = await generateDocAndUrl();
+      const notFoundUrl = url.replace("Table1", "NonExistingTable");
+
+      // when
+      const resp = await axios.put(notFoundUrl, { columns: [ COLUMN_TO_ADD ] }, chimpy);
+
+      // then
+      assert.equal(resp.status, 404);
+      assert.equal(resp.data.error, 'Table not found "NonExistingTable"');
+    });
+  });
+
   it("GET /docs/{did}/tables/{tid}/data returns 404 for non-existent doc", async function () {
     const resp = await axios.get(`${serverUrl}/api/docs/typotypotypo/tables/Table1/data`, chimpy);
     assert.equal(resp.status, 404);