I'm currently unable to upload any files to the file database. Anytime I attempt to upload a map, I immediately get sent to a browser error page that tells me "The connection to the server was reset while the page was loading."
i was getting exactly the same yesterday, my original file was a .zip , i then tried it as a .7z and it worked, but i thought it was just my connection playing up.
If this is your first time logging in after the migration (Feb 8, 2022), you must reset your password to log in. Follow this guide if you're having trouble