It appears that there is a restriction on uploading certain file types, specifically .md (Markdown) and .txt (plain text) files, which are commonly used formats.
But these types should be allowed inside the warning message,
Could you /someone please confirm if this is an intentional restriction or an oversight? If it’s the latter, I would like to request that support for .md and .txt files be considered for future updates to the Playground’s capabilities.
OpenAI has some unwanted document inspection or validation going on when uploading to assistants. This reached peak of frustration with valid JSON being rejected at one point unless they were purposely malformed (and I wrote a JSON confuser to get them uploaded).
Support for spacy is a bit broken, as it often requires you to download the specific models you want to use, which can’t be done (by GPT) because the code space doesn’t have access to the internet.
You’re problem is likely a temporary bug caused by OpenAI updating the backend or various service outages, I’m expecting this to be solved rather quickly.