Qwen模型调用工作流运行中止

在工作流内部直接上传文件可以正常处理，但是在对话页面上传文件并让其调用则一直运行中止

同时在大部分情况下还必须指明调用工作流，否则不会自主调用。

No source files or tests are named. Start by reproducing the Qwen workflow from the chat page with an uploaded file, then compare it with uploading the same file inside the workflow and check the behavior when the workflow is invoked implicitly versus explicitly. Done means the chat upload completes without aborting and the workflow is selected when appropriate.

Written by the indexing model from the issue text.