Unable to upload, 403 Error "Access Denied" [Fixed]
I'm trying to upload my first piece here but I'm unable to. The upload button on the site itself leads to the 403 error the title mention, and using the "File > Save Online..." option in my Musecore 3 download prompts me with the sign-in window, but immediately closes after I sign in. It briefly changes to show a "Congratulations!" but anything after that is gone too quickly for me to read. Help?
Update, Possible solution: Make sure your account's email address is verified.