With respect of your description, it maybe the system software limitation, so this unit can play the music from given folders, not the subfolders.
As you said, when the default app on the unit switch to other default once, it will stop the previous running app automatically.
For the third party app, you need to turn off the default app, then there is only one kind of sou from the third party apps.
Sorry, we don't have the way that you can set my favorite music player as default music player or something like that.
RegardsStatistics: Posted by Jammy — Fri Dec 30, 2016 3:17 am
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