diff --git a/extensions/qqbot/src/engine/api/media.test.ts b/extensions/qqbot/src/engine/api/media.test.ts
index e88bb9e9e30c..0db5351e60a4 100644
--- a/extensions/qqbot/src/engine/api/media.test.ts
+++ b/extensions/qqbot/src/engine/api/media.test.ts
@@ -451,4 +451,72 @@ describe("MediaApi.uploadMedia direct URL uploads", () => {
     expect(tokenManager["getAccessToken"]).not.toHaveBeenCalled();
     expect(client["request"]).not.toHaveBeenCalled();
   });
+
+  it("rejects promptly when a capture clone keeps body cancellation pending", async () => {
+    fetchWithSsrFGuardMock.mockReset();
+    const response = new Response(
+      new ReadableStream<Uint8Array>({
+        start(controller) {
+          controller.enqueue(new TextEncoder().encode("server error"));
+        },
+      }),
+      { status: 500 },
+    );
+    const captureClone = response.clone();
+    const release = vi.fn(async () => {});
+    fetchWithSsrFGuardMock.mockResolvedValueOnce({ response, release });
+
+    const body = response.body!;
+    const originalCancel = body.cancel.bind(body);
+    let cancellation: Promise<void> | undefined;
+    let cancellationSettled = false;
+    const cancellationStarted = new Promise<void>((resolve) => {
+      vi.spyOn(body, "cancel").mockImplementation((reason) => {
+        cancellation = originalCancel(reason).finally(() => {
+          cancellationSettled = true;
+        });
+        resolve();
+        return cancellation;
+      });
+    });
+
+    const client = mockApiClient();
+    const tokenManager = mockTokenManager();
+    const api = new MediaApi(client, tokenManager);
+    const upload = api.uploadMedia(
+      "c2c",
+      "user-openid",
+      MediaFileType.IMAGE,
+      { appId: "app-id", clientSecret: "client-secret" },
+      { url: "https://cdn.example.com/server-error.png" },
+    );
+    const cancellationPending = Symbol("capture cancellation pending");
+
+    try {
+      await cancellationStarted;
+      expect(cancellationSettled).toBe(false);
+
+      const result = await Promise.race([
+        upload.then(
+          () => undefined,
+          (error: unknown) => error,
+        ),
+        new Promise<symbol>((resolve) => {
+          setImmediate(() => resolve(cancellationPending));
+        }),
+      ]);
+
+      expect(result).not.toBe(cancellationPending);
+      expect(result).toMatchObject({
+        message: "Direct-upload media URL returned HTTP 500",
+      });
+      expect(release).toHaveBeenCalledOnce();
+      expect(tokenManager["getAccessToken"]).not.toHaveBeenCalled();
+      expect(client["request"]).not.toHaveBeenCalled();
+    } finally {
+      void captureClone.body?.cancel().catch(() => undefined);
+      await cancellation?.catch(() => undefined);
+      await upload.catch(() => undefined);
+    }
+  });
 });
diff --git a/extensions/qqbot/src/engine/api/media.ts b/extensions/qqbot/src/engine/api/media.ts
index 8c7a6f55b382..0f02dabb762d 100644
--- a/extensions/qqbot/src/engine/api/media.ts
+++ b/extensions/qqbot/src/engine/api/media.ts
@@ -161,7 +161,10 @@ export async function downloadDirectUploadUrl(
   const { response, release } = await fetchDirectUploadDownload(parsed.toString());
   try {
     if (!response.ok) {
-      await response.body?.cancel().catch(() => undefined);
+      // A debug-capture clone can keep the tee open, so waiting for cancel would
+      // hang before the error is returned. Fire-and-forget matches the timeout
+      // path above and the pattern used across other plugins.
+      void response.body?.cancel().catch(() => undefined);
       throw new Error(`Direct-upload media URL returned HTTP ${response.status}`);
     }
     return await readDirectUploadResponse(response, opts.maxBytes ?? MAX_UPLOAD_SIZE);