使用MCP上传图片失败

环境：
Windows + Workbuddy + 桌面版本的MultiPost

错误截图:

<img width="496" height="409" alt="Image" src="https://github.com/user-attachments/assets/4022059e-7970-4633-ac5b-66e8920e6a43" />

<img width="456" height="518" alt="Image" src="https://github.com/user-attachments/assets/fc6fc979-8b79-46fc-85c8-a15074c36093" />