Good app
The latest version is an improvement over the previous (which wouldnt play audio with the screen off, at least with iOS 9) in that it will play audio with the screen off. It has to be done in a weird, round about way though. Play the audio file, turn the screen off, turn it on (lock screen), press play, turn the screen off. 5 stars if it just continues to play when you turn the screen off...
AV8R88 about
Documents: File Manager & Docs, v5.7.3.