Playing music from an external source (USB drive)?

Hello,

I wish to play music from my USB drive (via an otg female USB to male microUSB adapter) on my N5. The problem is I can't find a(n) (free) app which can browse the specific usb directory; they all just show the internal storage one. My friend's LG G4's default music player detects the songs and plays them just fine.

Any help is highly appreciated! Thanks!

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