I am trying to re-upload a song to this site that I uploaded a while ago on a different account. But, when it finishes uploading the file, it gives me an error message saying, "This file is not a valid .mp3". The file plays in my iTunes fine, so I know it's not corrupted or anything. My only other guess is that the system has a feature to prevent plagiarism and it is rejecting the song because it already exists on my previous account. So, I went to my other account and deleted the submission, and it still said the same thing. I need a little bit of help.