The recent issues with uploading blends have been remedied. Thank you for alerting us to the issues and please continue to let us know if you have any other problems in the future!
Published April 24, 2023 by johnroper10017 failed uploads, site randomly 504's, 5 minutes just to load the contact form. site is pooched, please fix site
Hmm. Tried to upload a very simple file and it said something about stuff not being "packed" - I have no clue what that means.
I think it's something else. Blendswap requires external data, like image textures, to be packed. Otherwise people downloading your model will not get the textures. To do it, in blender top left corner press File -> External Data -> Pack Resources. https://docs.blender.org/manual/en/latest/files/blend/packed_data.html#pack-resources
I got an error today which looks the same as I got last month.
Upload Failed! Your blend does not meet our upload criteria because there was an issue validating your blend file on the server. If this continues to happen, please contact us.