I have the same problem. But when i edit some rule , it's works.
The first step: your file maybe mp3 extensions for music ( tried with video not yet)
The 2 step : your file must be < 2MB ( if you don't correct your server or host for enlarge for more )
The 3 : edit your account's member to accesss rule use music or video ( all rule can edit at Admin > setting > membership lever )
Chosee your type of member to edit rules.
It's work ! Sry for my english.