Here are some things you can do if you are unable to access a specific file in a Teams channel:
- Check if the file has been deleted or moved to another channel.
- Make sure you are signed in with the right user account.
- Ensure you have correct permissions to access the file.
- Check if the file is locked and that you have edit access.
- Look for another shared location where the file may have been moved.
- Ask a system administrator or the file creator if he/she can share the updated version of the file.
- Try again after a few minutes.