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In my Samsung with Android, when I open an MP3 file from the Dropbox folder, I hear the music, but when I go to another application, the music stops.
Is there a way to listen to the music in the background, while I do other things?
Go to the pop up menu for the file and select export, Then save it to the device. Now it's on your phone and can be played via your native media player
Download Google Play Music if it already isn't installed. It always works...