Yes you can but if must be more than 2 minutes long and make sure that you notify that it is a Demo on the Description section.
We dont secure your purchase if you had purchase from a seller, the seller must give you the right of the audio.
Yes we do verify every uploaded file. We will contact you if any information is requiered.
Yes you can now you are responsable of having the rights of your audio, it is just a reminder incase It is requiered to take down the aoudio.