I'm a site administrator experiencing the same error today, trying to upload a PDF for students for their class next week. Please review. My site still has available room and the file is fairly small (100k). I tried other files as well to see if it was a problem with the file specifically but unable to upload anything.
Thanks Jason, can you please try again and let me know if the issue persists?
It seems to be working now. Thank you for following up.