Whether you're uploading an audition for a project or a demo to your profile, please be sure that your audio file is in the following format:
Sample rate: 44.1kHz
Bit depth: 16 bit
Bitrate: 96 or 128 Kbps
If you get an error while uploading, please be sure to check these parameters! Most of the time, errors occur because of incorrect file formats/parameters.