diff --git a/fluxer_app/src/features/platform/transport/RestTransport.test.ts b/fluxer_app/src/features/platform/transport/RestTransport.test.ts
index 011787de7..0d407adcf 100644
--- a/fluxer_app/src/features/platform/transport/RestTransport.test.ts
+++ b/fluxer_app/src/features/platform/transport/RestTransport.test.ts
@@ -8,6 +8,17 @@ import {afterEach, beforeEach, describe, expect, test, vi} from 'vitest';
 
 vi.mock('@lingui/core/macro', () => ({msg: (descriptor: MessageDescriptor) => descriptor}));
 
+const desktopDocument = vi.hoisted(() => ({active: false}));
+
+vi.mock('@app/features/platform/DesktopLocalAppRuntime', async (importOriginal) => {
+	const actual = await importOriginal<typeof import('@app/features/platform/DesktopLocalAppRuntime')>();
+	return {...actual, isDesktopLocalAppDocument: () => desktopDocument.active};
+});
+
+vi.mock('@app/features/ui/utils/NativeUtils', () => ({
+	getElectronAPI: () => (desktopDocument.active ? {localAppUpload: {subscribe: () => () => {}}} : undefined),
+}));
+
 interface SentRequest {
 	method: string;
 	url: string;
@@ -95,6 +106,31 @@ beforeEach(() => {
 
 afterEach(() => {
 	vi.unstubAllGlobals();
+	desktopDocument.active = false;
+});
+
+describe('RestClient desktop local upload tagging', () => {
+	const uploadIdHeader = 'x-fluxer-local-upload-id';
+
+	test('a remote upload from the desktop app never carries the local upload id', async () => {
+		desktopDocument.active = true;
+		await createClient().put('https://uploads.fluxer.app/v1/relay/abc?t=token', {
+			body: new Blob(['x']),
+			auth: 'none',
+			onProgress: () => {},
+		});
+		expect(sent[0].headers[uploadIdHeader]).toBeUndefined();
+	});
+
+	test('an upload through the desktop local proxy is tagged for progress', async () => {
+		desktopDocument.active = true;
+		await createClient().put('fluxer-app://app/_remote/key?url=https%3A%2F%2Fuploads.test%2Fv1%2Frelay%2Fabc', {
+			body: new Blob(['x']),
+			auth: 'none',
+			onProgress: () => {},
+		});
+		expect(sent[0].headers[uploadIdHeader]).toMatch(/^[0-9a-f]{32}$/u);
+	});
 });
 
 describe('RestClient interceptor selection', () => {
diff --git a/fluxer_app/src/features/platform/transport/RestTransport.ts b/fluxer_app/src/features/platform/transport/RestTransport.ts
index 0429e363d..1a4e7e173 100644
--- a/fluxer_app/src/features/platform/transport/RestTransport.ts
+++ b/fluxer_app/src/features/platform/transport/RestTransport.ts
@@ -715,8 +715,23 @@ function newLocalUploadId(): string {
 	return Array.from(bytes, (byte) => byte.toString(16).padStart(2, '0')).join('');
 }
 
-function attachLocalUploadProgress(xhr: XMLHttpRequest, onProgress: (event: ProgressEvent) => void): boolean {
-	if (!isDesktopLocalAppDocument()) {
+function isDesktopLocalAppRequest(url: string): boolean {
+	if (!isDesktopLocalAppDocument()) return false;
+	let parsedUrl: URL;
+	try {
+		parsedUrl = resolveDocumentURLFromRoot(url);
+	} catch {
+		return false;
+	}
+	return isDesktopLocalAppOrigin(parsedUrl.protocol, parsedUrl.hostname);
+}
+
+function attachLocalUploadProgress(
+	xhr: XMLHttpRequest,
+	url: string,
+	onProgress: (event: ProgressEvent) => void,
+): boolean {
+	if (!isDesktopLocalAppRequest(url)) {
 		return false;
 	}
 	const subscribe = getElectronAPI()?.localAppUpload?.subscribe;
@@ -768,7 +783,7 @@ function performTransport(plan: Plan, handle: RestRequestHandle): Promise<Transp
 			externalSignal.removeEventListener('abort', onExternalAbort);
 		});
 		if (plan.onProgress) {
-			if (!attachLocalUploadProgress(xhr, plan.onProgress)) {
+			if (!attachLocalUploadProgress(xhr, plan.url, plan.onProgress)) {
 				xhr.upload.addEventListener('progress', plan.onProgress);
 			}
 		}