The current Google Play Music app seems to have 2 interfaces. There is the normal, "full" interface that you get when you open the app directly. There's another "mini" interface that you get when you try to open a music file from a file explorer. It opens up this stupid control on your screen where you can listen to the file, but if you try to touch anywhere on the screen, swipe, or turn the power off, the player control goes away and the music stops playing, so you have to start the whole thing over again.
Is there a way to have files open directly with the normal, "full" interface?