> ## Documentation Index
> Fetch the complete documentation index at: https://docs.stefanbrain.com/llms.txt
> Use this file to discover all available pages before exploring further.

> ## Agent Instructions
> Follow the content contract in AGENTS.md.
> Treat text as the canonical explanation; video and screenshots enhance it.
> Do not publish unverified product behavior or duplicate an existing canonical article.

# Fix a file that won’t upload or process

> Troubleshoot rejected uploads, files stuck processing, and attachments StefanBrain cannot read.

If your file is rejected, stays processing, or cannot be read, use the checks below to get it ready for your Chat. Check the existing upload before adding another copy.

## Check where the file belongs

* **One conversation:** attach it to that Chat.
* **Several Chats in a Project:** add it to the Project and wait until processing finishes.

See [Give Chat the right context](/knowledge-base/chat/give-chat-the-right-context) for choosing between these inputs.

## Match the fix to the problem

| What happens | What to check |
| - | - |
| The file picker rejects the file | Use a format accepted by that upload control. Different upload locations can support different inputs. |
| The file exceeds a displayed limit | Export a smaller version or split it into useful sections. Keep an unchanged original. |
| Uploading does not finish | Check your connection and preserve your prompt before refreshing. Confirm the file is not already attached before retrying. |
| The file is still processing | Wait for processing to finish before asking StefanBrain to use it. Do not upload repeated copies while it is working. |
| StefanBrain cannot read the content | Open the file yourself and check that the content is present and readable. Try a clean export in a supported format. |
| The answer uses the wrong source | Name the intended file and explain which sections matter. Confirm you are in the correct Chat or Project. |

Changing a filename extension does not convert a file into another format.

## Confirm StefanBrain can read your file

Ask StefanBrain to identify the relevant section or summarize a small part of the file. Confirm it matches before requesting a larger analysis.

If the problem repeats, email [support@stefanbrain.com](mailto:support@stefanbrain.com) with the file type, size, upload location, and exact error. Do not attach confidential source files unless support specifically needs them and you are authorized to share them.


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