I tried to upload the project to Sketchfab but I am getting Error 13. However, other platforms work. I used blend and fbx formats. Here is the link to other service: https://glb.ee/fxb355xa
I'm also receiving the error 13 when trying to upload. I've never exported a file in my life though so I'm probably doing something wrong.
UPD: Something was wrong with the site, now it is working normally.