Problem connecting xdj-rx through rekordbox mobile app

I got a new phone today, moto g3 and I had the moto x 2013 and I also have the xdj-rx. Previously I could connect my moto x to the mixer with the usb cable and no problem at all, now I downloaded the app on my new phone and It doesn't recognize the rx at all, not even with the old phone. Exporting music on my pc and later on plug in a flash drive works like a charm. But for some reason now either of my phones can recognize the rx anymore. Anyone got a solution? 

I already got an answer on a post but that didn't work, both my phones support mtp, and both should be able to communicate with the rx, the moto x could before. Also I have the latest firmware, 2.20 on my rx. Anyone got a solution to this? I really need to be able to connect my phone to the mixer, it's a solid backup, please pioneer help me out