ChatGPT saying Unknown Error Occurred for File Uploads
OpenAI Developer Community
March 7, 2026
Curious to understand the scope here.
A couple quick questions that would help narrow it down:
- Does this only happen when uploading code files, or do you see the same behavior with other file types as well?
- Are you seeing this inside ChatGPT, or inside a Custom GPT?
If you’re able to reproduce it consistently, the fastest way for us to investigate is through a support ticket, please send the following to support@openai.com:
- A HAR file from the session where the upload fails
- The conversation ID
- The timestamp when the error occurred
- The exact error message, if one appears
That should give the team enough detail to trace what’s happening on the backend.
-Will
Discussion in the ATmosphere