Unable to read OTG USB key in DJAY 2 (2.2.7) Android

Good Day, I just bought DJAY 2 (ver. 2.2.7) for android on my Nexus 6P (OS 7.1.2) and it is not able to read my USB key. I can actually see the content of the key with the system explorer and start an MP3 no problem.

Hey BenitoB,

please make sure that the Play Music application can access the USB stick.

Cheers,Lukas E.