somthing I have trouble with – Vit Mate - Video Player Review

I’m an animator and I’m finding apps that let me play music while I’m animated.So I found this and I thought it would let me do that.After a few days it wouldn’t let me play music while I’m animating.Please fix this problem,I would appreciate it.
Review by Lucaslobo1468 on Vit Mate - Video Player.