I finally grabbed a USB-C to USB-A cable for my Nexus 5X, so I can use it with my Phantom 4.
I tested flying my 5x today in split-screen, it works but is buggy. I was using YouTube as the second app which is good if you want to Live Stream to YouTube from the Phantom 4 and will enable you to actually see comments that you can respond to in the YouTube app when in split-screen. Currently only Facebook allows you to see comments and you can't respond to those either other than commenting verbally.
I grabbed my 3-foot cable on Amazon for $23.. it supports USB 2.0, 3.0, and 3.1.
Belkin 3 ft USB-C cable; http://amzn.to/2bv4qJe