Won't play the music I added to it, just crashes – All-in-one MP3 Player - DONUT Player Review

I got this app because I had some MP3 files I didn't want to add to iTunes. However, even though adding the files to the app seemed easy, finding them was hard and when I played them, the app just crashed.
Review by yokunaikoto on All-in-one MP3 Player - DONUT Player.