Unable to upload creations due to 'Unknown error' and 'File not found'

Bug: Unable to upload creations due to 'Unknown error' and 'File not found'

This issue is a duplicate of #9 Workshop upload gets stuck at 40% and results in a ghost file.

This is nothing to worry about. This report has been linked to the original issue and will act as a vote for it. Any media attached to this report will be accessible from the original issue.

Unable to upload creations due to 'Unknown error' and 'File not found'

Status:	Duplicate
Added by:	Steam Community on October 9, '26

Steps to Reproduce

No steps to reproduce

Explanation

The user is unable to upload any creations, receiving 'Unknown error' and 'File not found' errors. Despite trying different creations and deleting mods, the issue persists.

Original post on Steam:
> well I tried everything I cannot upload anything I tried to upload a train it didnt work so I thought the train was broken apparently not because my test car also wouldnt publish I keep getting the same 2 errors one is when I say upload Unknown error but when I Upload as it says File not found can some please help me btw in my creations theres just blank stuff with no information

Steam thread: https://steamcommunity.com/app/552100/discussions/1/567036688513201586/

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Bug: Unable to upload creations due to 'Unknown error' and 'File not found'