diff --git a/apps/desktop/src/components/transfer/DataTransferDialog.vue b/apps/desktop/src/components/transfer/DataTransferDialog.vue
index 80739a6625..007db471f2 100644
--- a/apps/desktop/src/components/transfer/DataTransferDialog.vue
+++ b/apps/desktop/src/components/transfer/DataTransferDialog.vue
@@ -4,7 +4,7 @@ import { uuid } from "@/lib/common/utils";
 import { useI18n } from "vue-i18n";
 import { Dialog, DialogContent, DialogDescription, DialogHeader, DialogTitle, DialogFooter } from "@/components/ui/dialog";
 import { Button } from "@/components/ui/button";
-import { buildTransferObjectSelections } from "./transferSelections";
+import { buildTransferObjectSelections, countTransferObjects } from "./transferSelections";
 import { createTaskLoadTracker } from "./taskLoadTracker";
 import { confirmTransferWithProductionSafety, createTransferSubmission, rebuildUnavailableReason, resolveTransferStrategy, transferStrategyOptions, type TransferStrategy } from "./transferStrategy";
 import { Input } from "@/components/ui/input";
@@ -815,6 +815,7 @@ function runTransfer(request: api.TransferRequest, shouldRefreshTargetTree: bool
   isSubmitting.value = true;
   startDataTransferTask(request, `${request.sourceDatabase} → ${request.targetDatabase}`, {
     formatOverlapError: (tables) => t("transfer.targetTableBusy", { tables: tables.join(", ") }),
+    onStarted: () => toast(t("transfer.backgroundStarted")),
     onDone: async () => {
       if (shouldRefreshTargetTree) {
         await store.refreshObjectListTreeNode(request.targetConnectionId, request.targetDatabase, request.targetSchema, request.targetCatalog);
@@ -1052,7 +1053,7 @@ const confirmationSummary = computed(() => {
   if (!request) return "";
   const source = formatTransferEndpointLabel(getConnectionName(request.sourceConnectionId), request.sourceDatabase, request.sourceSchema, request.sourceCatalog);
   const target = formatTransferEndpointLabel(getConnectionName(request.targetConnectionId), request.targetDatabase, request.targetSchema, request.targetCatalog);
-  const count = request.tables.length + request.objects.reduce((total, selection) => total + selection.names.length, 0);
+  const count = countTransferObjects(request);
   return t("transfer.startConfirmMessage", { source, target, count });
 });
 
diff --git a/apps/desktop/src/components/transfer/__tests__/transferSelections.spec.ts b/apps/desktop/src/components/transfer/__tests__/transferSelections.spec.ts
index efd0173112..7d8ac5451d 100644
--- a/apps/desktop/src/components/transfer/__tests__/transferSelections.spec.ts
+++ b/apps/desktop/src/components/transfer/__tests__/transferSelections.spec.ts
@@ -1,10 +1,28 @@
 import { describe, expect, it } from "vitest";
-import { buildTransferObjectSelections, matchBulkObjectNames, parseBulkObjectNames } from "../transferSelections";
+import { buildTransferObjectSelections, countTransferObjects, matchBulkObjectNames, parseBulkObjectNames } from "../transferSelections";
 
 function setOf(names: string[]): Set<string> {
   return new Set(names);
 }
 
+describe("countTransferObjects", () => {
+  it("counts selected tables and non-table objects from their separate request fields", () => {
+    expect(
+      countTransferObjects({
+        tables: ["orders", "users"],
+        objects: [
+          { objectType: "VIEW", names: ["active_users"] },
+          { objectType: "SEQUENCE", names: ["order_id_seq"] },
+        ],
+      }),
+    ).toBe(4);
+  });
+
+  it("keeps a table-only multi-selection nonzero", () => {
+    expect(countTransferObjects({ tables: ["orders", "users"], objects: [] })).toBe(2);
+  });
+});
+
 describe("buildTransferObjectSelections", () => {
   it("serializes non-table selections in request order", () => {
     const result = buildTransferObjectSelections(
diff --git a/apps/desktop/src/components/transfer/transferSelections.ts b/apps/desktop/src/components/transfer/transferSelections.ts
index 7e2fbadd6d..17f43ba4ea 100644
--- a/apps/desktop/src/components/transfer/transferSelections.ts
+++ b/apps/desktop/src/components/transfer/transferSelections.ts
@@ -1,10 +1,15 @@
-import type { TransferObjectKind } from "@/lib/backend/api";
+import type { TransferObjectKind, TransferRequest } from "@/lib/backend/api";
 
 export interface TransferObjectSelectionPayload {
   objectType: TransferObjectKind;
   names: string[];
 }
 
+/** Counts table and non-table selections represented by a transfer request. */
+export function countTransferObjects(request: Pick<TransferRequest, "tables" | "objects">): number {
+  return request.tables.length + request.objects.reduce((total, selection) => total + selection.names.length, 0);
+}
+
 /**
  * Builds the `objects` payload of a transfer request from the tree
  * selection state. TABLE is handled by `tables`, and object types that
diff --git a/apps/desktop/src/composables/__tests__/useExportTracker.spec.ts b/apps/desktop/src/composables/__tests__/useExportTracker.spec.ts
index ff07588a10..270088b9c7 100644
--- a/apps/desktop/src/composables/__tests__/useExportTracker.spec.ts
+++ b/apps/desktop/src/composables/__tests__/useExportTracker.spec.ts
@@ -35,10 +35,14 @@ function transferRequest(transferId: string, tables = ["users"]): TransferReques
     targetSchema: "public",
     tables,
     createTable: true,
+    content: "structureAndData",
+    objects: [],
     mode: "append",
     targetTableNameCase: "preserve",
     quoteTargetColumnNames: true,
     batchSize: 1000,
+    dropTargetBeforeCreate: false,
+    dropTargetConfirmed: false,
   };
 }
 
@@ -138,16 +142,46 @@ describe("data transfer task duration", () => {
   it("records an immediate start failure as a terminal duration", async () => {
     vi.mocked(api.startTransfer).mockRejectedValueOnce(new Error("start failed"));
     const tracker = useExportTracker();
+    const onStarted = vi.fn();
     now = 10_000;
-    const task = tracker.startDataTransferTask(transferRequest("start-failure"), "users");
+    const task = tracker.startDataTransferTask(transferRequest("start-failure"), "users", { onStarted });
     now = 10_025;
 
     await vi.waitFor(() => expect(task.status).toBe("Error"));
 
+    expect(onStarted).not.toHaveBeenCalled();
     expect(task.finishedAt! - task.startedAt!).toBe(25);
     expect(task.errorMessage).toBe("start failed");
   });
 
+  it.each([
+    ["append", { content: "structureAndData", mode: "append", createTable: true, dropTargetBeforeCreate: false }],
+    ["rebuild", { content: "structureAndData", mode: "append", createTable: true, dropTargetBeforeCreate: true }],
+    ["data-only", { content: "dataOnly", mode: "append", createTable: false, dropTargetBeforeCreate: false }],
+  ] as const)("launches one %s task and acknowledges its accepted submission once", async (_flow, overrides) => {
+    let finishTransfer!: () => void;
+    vi.mocked(api.startTransfer).mockImplementationOnce((_request, _onProgress, onStarted) => {
+      onStarted?.();
+      onStarted?.();
+      return new Promise<void>((resolve) => {
+        finishTransfer = resolve;
+      });
+    });
+    const tracker = useExportTracker();
+    const onStarted = vi.fn();
+    const request = { ...transferRequest(`start-${_flow}`), ...overrides };
+
+    const task = tracker.startDataTransferTask(request, _flow, { onStarted });
+
+    expect(task.status).toBe("Running");
+    expect(api.startTransfer).toHaveBeenCalledTimes(1);
+    expect(vi.mocked(api.startTransfer).mock.calls[0]?.[0]).toMatchObject(overrides);
+    expect(onStarted).toHaveBeenCalledTimes(1);
+
+    finishTransfer();
+    await Promise.resolve();
+  });
+
   it("freezes an overlapping transfer failure without starting another request", async () => {
     let resolveFirst!: () => void;
     vi.mocked(api.startTransfer).mockImplementationOnce(() => new Promise<void>((resolve) => (resolveFirst = resolve)));
@@ -155,11 +189,13 @@ describe("data transfer task duration", () => {
     now = 100;
     tracker.startDataTransferTask(transferRequest("active"), "active");
     now = 130;
-    const overlapping = tracker.startDataTransferTask(transferRequest("overlap"), "overlap");
+    const onStarted = vi.fn();
+    const overlapping = tracker.startDataTransferTask(transferRequest("overlap"), "overlap", { onStarted });
 
     expect(overlapping.status).toBe("Error");
     expect(overlapping.finishedAt! - overlapping.startedAt!).toBe(0);
     expect(api.startTransfer).toHaveBeenCalledTimes(1);
+    expect(onStarted).not.toHaveBeenCalled();
 
     resolveFirst();
     await Promise.resolve();
diff --git a/apps/desktop/src/composables/useExportTracker.ts b/apps/desktop/src/composables/useExportTracker.ts
index abde14a765..1d832f37ed 100644
--- a/apps/desktop/src/composables/useExportTracker.ts
+++ b/apps/desktop/src/composables/useExportTracker.ts
@@ -582,6 +582,7 @@ export function useExportTracker() {
     request: api.TransferRequest,
     label: string,
     options: {
+      onStarted?: () => void;
       onDone?: () => void | Promise<void>;
       formatOverlapError?: (tables: string[]) => string;
     } = {},
@@ -607,13 +608,23 @@ export function useExportTracker() {
 
     activeTransferRuns.add(request.transferId);
     let terminalStatus: api.TransferProgress["status"] | null = null;
+    let startAcknowledged = false;
+    const acknowledgeStart = () => {
+      if (startAcknowledged) return;
+      startAcknowledged = true;
+      options.onStarted?.();
+    };
 
     void (async () => {
       try {
-        await api.startTransfer(request, (progress) => {
-          terminalStatus = isTerminalTransferProgress(progress) ? progress.status : terminalStatus;
-          updateDataTransferTask(progress.transferId, progress);
-        });
+        await api.startTransfer(
+          request,
+          (progress) => {
+            terminalStatus = isTerminalTransferProgress(progress) ? progress.status : terminalStatus;
+            updateDataTransferTask(progress.transferId, progress);
+          },
+          acknowledgeStart,
+        );
 
         if (terminalStatus === "done" && task.status === "Done") {
           await options.onDone?.();
diff --git a/apps/desktop/src/i18n/__tests__/featureMessages.spec.ts b/apps/desktop/src/i18n/__tests__/featureMessages.spec.ts
index 6a5398326c..068399f85f 100644
--- a/apps/desktop/src/i18n/__tests__/featureMessages.spec.ts
+++ b/apps/desktop/src/i18n/__tests__/featureMessages.spec.ts
@@ -67,6 +67,7 @@ const FEATURE_MESSAGES: FeatureMessages[] = [
   { feature: "plugin marketplace sorting (#10078)", keys: under("pluginPlatform", ["sortBy", "sortByName", "sortByRecentlyUpdated", "sortByRecentlyListed", "sortByUpdatesFirst"]), locales: EXCEPT_AZ_TR, translated: true },
   { feature: "shared refresh action (#8768)", keys: ["common.refresh"] },
   { feature: "transfer bulk select", keys: under("transfer", ["bulkSelectObjects", "bulkSelectTitle", "bulkSelectHint", "bulkSelectPlaceholder", "bulkSelectConfirm", "bulkSelectMatched", "bulkSelectUnmatched", "noMatchingObjects"]), translated: true },
+  { feature: "transfer background acknowledgement (#8649)", keys: ["transfer.backgroundStarted"], translated: true },
   { feature: "table info pin", keys: ["grid.pinTableInfo", "grid.unpinTableInfo"], translated: true },
   { feature: "Consul workspace", keys: ["consul.ui.*", "consul.tools.*"] },
   { feature: "MQTT max packet size", keys: ["connection.mqttMaxPacketSize"] },
diff --git a/apps/desktop/src/i18n/locales/az.ts b/apps/desktop/src/i18n/locales/az.ts
index 03087ddc76..249a5147b5 100644
--- a/apps/desktop/src/i18n/locales/az.ts
+++ b/apps/desktop/src/i18n/locales/az.ts
@@ -6159,6 +6159,7 @@ export default withEnglishFallback({
     overallProgress: "Ümumi gedişat",
     dataTransfer: "Məlumatların köçürülməsi",
     runInBackground: "Arxa planda işlət",
+    backgroundStarted: "Köçürmə arxa planda başladı. Gedişatı fon tapşırıqlarında izləyə bilərsiniz.",
     newTask: "Yeni köçürmə",
     editConfig: "Konfiqurasiyanı redaktə et",
     retry: "Yenidən cəhd et",
diff --git a/apps/desktop/src/i18n/locales/en.ts b/apps/desktop/src/i18n/locales/en.ts
index 5a654e9a0d..f5b7f7dcb4 100644
--- a/apps/desktop/src/i18n/locales/en.ts
+++ b/apps/desktop/src/i18n/locales/en.ts
@@ -6760,6 +6760,7 @@ export default {
     overallProgress: "Overall progress",
     dataTransfer: "Data Transfer",
     runInBackground: "Run in background",
+    backgroundStarted: "Transfer started in the background. View progress in Background Tasks.",
     newTask: "New transfer",
     editConfig: "Edit config",
     retry: "Retry",
diff --git a/apps/desktop/src/i18n/locales/es.ts b/apps/desktop/src/i18n/locales/es.ts
index 01f7687886..0b8016aa4a 100644
--- a/apps/desktop/src/i18n/locales/es.ts
+++ b/apps/desktop/src/i18n/locales/es.ts
@@ -6198,6 +6198,7 @@ export default withEnglishFallback({
     swap: "Intercambiar origen y destino",
     targetSchema: "Esquema de destino",
     runInBackground: "Ejecutar en segundo plano",
+    backgroundStarted: "La transferencia comenzó en segundo plano. Consulta el progreso en Tareas en segundo plano.",
     newTask: "Nueva transferencia",
     editConfig: "Editar config",
     retry: "Reintentar",
diff --git a/apps/desktop/src/i18n/locales/it.ts b/apps/desktop/src/i18n/locales/it.ts
index 566586b849..1ffdbb6e29 100644
--- a/apps/desktop/src/i18n/locales/it.ts
+++ b/apps/desktop/src/i18n/locales/it.ts
@@ -6121,6 +6121,7 @@ export default withEnglishFallback({
     overallProgress: "Progresso complessivo",
     dataTransfer: "Trasferimento Dati",
     runInBackground: "Esegui in background",
+    backgroundStarted: "Il trasferimento è iniziato in background. Puoi verificarne l'avanzamento nelle attività in background.",
     newTask: "Nuovo trasferimento",
     editConfig: "Modifica config",
     retry: "Riprova",
diff --git a/apps/desktop/src/i18n/locales/ja.ts b/apps/desktop/src/i18n/locales/ja.ts
index 139ea7c296..8229479931 100644
--- a/apps/desktop/src/i18n/locales/ja.ts
+++ b/apps/desktop/src/i18n/locales/ja.ts
@@ -6142,6 +6142,7 @@ export default withEnglishFallback({
     overallProgress: "全体の進捗",
     dataTransfer: "データ転送",
     runInBackground: "バックグラウンドで実行",
+    backgroundStarted: "転送をバックグラウンドで開始しました。進行状況はバックグラウンドタスクで確認できます。",
     newTask: "新規転送",
     editConfig: "設定を編集",
     retry: "リトライ",
diff --git a/apps/desktop/src/i18n/locales/ko.ts b/apps/desktop/src/i18n/locales/ko.ts
index a9f43e5f58..8413924f3f 100644
--- a/apps/desktop/src/i18n/locales/ko.ts
+++ b/apps/desktop/src/i18n/locales/ko.ts
@@ -5848,6 +5848,7 @@ export default withEnglishFallback({
     overallProgress: "전체 진행률",
     dataTransfer: "데이터 이전",
     runInBackground: "백그라운드에서 실행",
+    backgroundStarted: "전송이 백그라운드에서 시작되었습니다. 백그라운드 작업에서 진행 상황을 확인할 수 있습니다.",
     newTask: "새 이전",
     editConfig: "설정 편집",
     retry: "다시 시도",
diff --git a/apps/desktop/src/i18n/locales/pt-BR.ts b/apps/desktop/src/i18n/locales/pt-BR.ts
index 9ed0b537d9..c3f0bb2ce6 100644
--- a/apps/desktop/src/i18n/locales/pt-BR.ts
+++ b/apps/desktop/src/i18n/locales/pt-BR.ts
@@ -6122,6 +6122,7 @@ export default withEnglishFallback({
     overallProgress: "Progresso geral",
     dataTransfer: "Transferência de Dados",
     runInBackground: "Executar em segundo plano",
+    backgroundStarted: "A transferência foi iniciada em segundo plano. Acompanhe o progresso nas tarefas em segundo plano.",
     newTask: "Nova transferência",
     editConfig: "Editar configuração",
     retry: "Tentar novamente",
diff --git a/apps/desktop/src/i18n/locales/ru.ts b/apps/desktop/src/i18n/locales/ru.ts
index c2ba30358a..4a9214f2b9 100644
--- a/apps/desktop/src/i18n/locales/ru.ts
+++ b/apps/desktop/src/i18n/locales/ru.ts
@@ -7280,6 +7280,7 @@ export default withEnglishFallback({
     overallProgress: "Общий прогресс",
     dataTransfer: "Перенос данных",
     runInBackground: "Выполнить в фоне",
+    backgroundStarted: "Перенос запущен в фоновом режиме. Ход выполнения можно посмотреть в фоновых задачах.",
     newTask: "Новый перенос",
     editConfig: "Изменить конфигурацию",
     retry: "Повторить",
diff --git a/apps/desktop/src/i18n/locales/tr.ts b/apps/desktop/src/i18n/locales/tr.ts
index c68cd23cd5..1255cd1504 100644
--- a/apps/desktop/src/i18n/locales/tr.ts
+++ b/apps/desktop/src/i18n/locales/tr.ts
@@ -6043,6 +6043,7 @@ export default withEnglishFallback({
     overallProgress: "Genel ilerleme",
     dataTransfer: "Veri Aktarımı",
     runInBackground: "Arka planda çalıştır",
+    backgroundStarted: "Aktarım arka planda başlatıldı. İlerlemeyi arka plan görevlerinde görüntüleyebilirsiniz.",
     newTask: "Yeni aktarım",
     editConfig: "Yapılandırmayı düzenle",
     retry: "Yeniden dene",
diff --git a/apps/desktop/src/i18n/locales/zh-CN.ts b/apps/desktop/src/i18n/locales/zh-CN.ts
index 99c9e5adc1..9d5a94601b 100644
--- a/apps/desktop/src/i18n/locales/zh-CN.ts
+++ b/apps/desktop/src/i18n/locales/zh-CN.ts
@@ -6727,6 +6727,7 @@ export default withEnglishFallback({
     overallProgress: "整体进度",
     dataTransfer: "数据传输",
     runInBackground: "后台运行",
+    backgroundStarted: "传输已在后台开始，可在后台任务中查看进度。",
     newTask: "新建传输",
     editConfig: "编辑配置",
     retry: "重新传输",
diff --git a/apps/desktop/src/i18n/locales/zh-TW.ts b/apps/desktop/src/i18n/locales/zh-TW.ts
index b0427fc378..d08322c23b 100644
--- a/apps/desktop/src/i18n/locales/zh-TW.ts
+++ b/apps/desktop/src/i18n/locales/zh-TW.ts
@@ -5431,6 +5431,7 @@ export default withEnglishFallback({
     tableNameCaseLower: "小寫",
     tableNameCaseUpper: "大寫",
     runInBackground: "背景執行",
+    backgroundStarted: "傳輸已在背景開始，可在背景任務中查看進度。",
     newTask: "新增傳輸",
     editConfig: "編輯配置",
     retry: "重試",
diff --git a/apps/desktop/src/lib/backend/__tests__/dataTransferStart.spec.ts b/apps/desktop/src/lib/backend/__tests__/dataTransferStart.spec.ts
new file mode 100644
index 0000000000..a13bbd0c0c
--- /dev/null
+++ b/apps/desktop/src/lib/backend/__tests__/dataTransferStart.spec.ts
@@ -0,0 +1,84 @@
+import { afterEach, describe, expect, it, vi } from "vitest";
+import type { TransferProgress, TransferRequest } from "@/lib/backend/http";
+import { startTransfer } from "@/lib/backend/http";
+
+function request(): TransferRequest {
+  return {
+    transferId: "transfer-1",
+    sourceConnectionId: "source",
+    sourceDatabase: "app",
+    sourceSchema: "public",
+    targetConnectionId: "target",
+    targetDatabase: "warehouse",
+    targetSchema: "reporting",
+    tables: ["orders", "users"],
+    createTable: true,
+    content: "structureAndData",
+    objects: [],
+    mode: "append",
+    targetTableNameCase: "preserve",
+    quoteTargetColumnNames: true,
+    ownershipPolicy: "preserve",
+    batchSize: 1000,
+    dropTargetBeforeCreate: false,
+    dropTargetConfirmed: false,
+  };
+}
+
+function doneProgress(): TransferProgress {
+  return {
+    transferId: "transfer-1",
+    table: "users",
+    tableIndex: 2,
+    totalTables: 2,
+    rowsTransferred: 3,
+    totalRows: 3,
+    status: "done",
+    error: null,
+    terminal: true,
+  };
+}
+
+describe("web data-transfer submission", () => {
+  afterEach(() => vi.unstubAllGlobals());
+
+  it("acknowledges an accepted task once before tracking its progress", async () => {
+    vi.stubGlobal("fetch", vi.fn().mockResolvedValue({ ok: true }));
+    let source: FakeEventSource | undefined;
+    class FakeEventSource {
+      onmessage: ((event: { data: string }) => void) | null = null;
+      onerror: (() => void) | null = null;
+      close = vi.fn();
+
+      constructor(readonly url: string) {
+        source = this;
+      }
+    }
+    vi.stubGlobal("EventSource", FakeEventSource);
+    const onStarted = vi.fn();
+    const onProgress = vi.fn();
+
+    const pending = startTransfer(request(), onProgress, onStarted);
+    await vi.waitFor(() => expect(onStarted).toHaveBeenCalledTimes(1));
+
+    expect(source?.url).toBe("/api/transfer/progress/transfer-1");
+    source?.onmessage?.({ data: JSON.stringify(doneProgress()) });
+    await expect(pending).resolves.toBeUndefined();
+    expect(onStarted).toHaveBeenCalledTimes(1);
+    expect(onProgress).toHaveBeenCalledWith(doneProgress());
+  });
+
+  it("suppresses acknowledgement when task creation fails", async () => {
+    vi.stubGlobal(
+      "fetch",
+      vi.fn().mockResolvedValue({
+        ok: false,
+        text: vi.fn().mockResolvedValue('{"message":"rejected"}'),
+      }),
+    );
+    const onStarted = vi.fn();
+
+    await expect(startTransfer(request(), vi.fn(), onStarted)).rejects.toThrow();
+    expect(onStarted).not.toHaveBeenCalled();
+  });
+});
diff --git a/apps/desktop/src/lib/backend/http.ts b/apps/desktop/src/lib/backend/http.ts
index d44ae9f057..d651b95a49 100644
--- a/apps/desktop/src/lib/backend/http.ts
+++ b/apps/desktop/src/lib/backend/http.ts
@@ -2805,7 +2805,7 @@ export async function saveGlobalSearchSettings(settings: GlobalSearchSettings):
 // Data Transfer
 // ---------------------------------------------------------------------------
 
-export async function startTransfer(request: TransferRequest, onProgress: (progress: TransferProgress) => void): Promise<void> {
+export async function startTransfer(request: TransferRequest, onProgress: (progress: TransferProgress) => void, onStarted?: () => void): Promise<void> {
   // 1. POST to start the transfer
   const res = await fetch(apiUrl("/api/transfer/start"), {
     method: "POST",
@@ -2813,6 +2813,7 @@ export async function startTransfer(request: TransferRequest, onProgress: (progr
     body: JSON.stringify({ request }),
   });
   if (!res.ok) throw await backendResponseError(res);
+  onStarted?.();
 
   // 2. SSE to listen for progress
   return new Promise((resolve, reject) => {
diff --git a/apps/desktop/src/lib/backend/tauri.ts b/apps/desktop/src/lib/backend/tauri.ts
index 762483e5e6..981ade5191 100644
--- a/apps/desktop/src/lib/backend/tauri.ts
+++ b/apps/desktop/src/lib/backend/tauri.ts
@@ -5324,7 +5324,7 @@ export interface TransferProgress {
   transferFailuresOmitted?: number;
 }
 
-export async function startTransfer(request: TransferRequest, onProgress: (progress: TransferProgress) => void): Promise<void> {
+export async function startTransfer(request: TransferRequest, onProgress: (progress: TransferProgress) => void, onStarted?: () => void): Promise<void> {
   return new Promise((resolve, reject) => {
     let unlisten: UnlistenFn | null = null;
     void (async () => {
@@ -5339,6 +5339,7 @@ export async function startTransfer(request: TransferRequest, onProgress: (progr
         });
 
         await invoke("start_transfer", { request });
+        onStarted?.();
       } catch (e) {
         unlisten?.();
         reject(e instanceof BackendErrorException ? e : new BackendErrorException(e));