Unable to add XLSX or CSV files in Playground

I’m having a play around with the assisstant API in the playground and am trying to upload my custom data but it does not seem to accept .xlsx or .csv files, I keep getting this error:

Failed to update assistant: UserError: Failed to index file: Unsupported file file-59kQOlQYbS6HcjTWZv4gGTAZ type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet

Is there a specific format required or is this just a temporary bug?


I am experiencing the same problem. Looks like .xlxs files are supported according to this page though.