When uploading a track, your uploading page might get grayed out and the uploading will stop as we don't recognize the audio file. 

To resolve this, we recommend the following:

• To be on the safe side, make sure your file is exported in .wav or .mp3 and encoded in 44.1kHz and 16bit.
• Also check so the file size is not larger than 4GB and the track can not be longer than 6 hours and 45 minutes. 

• Make sure the URL of the track doesn't end with a character such as "%" or "&". 

• You may also want to try a different browser (Firefox, Chrome, etc.) to see if the issue continues. 

• Make sure that there are no emojis in the track title metadata or custom fonts.

Still need help? File a ticket.