No go with my Android 6.0.1 Moto G4 Play - it runs all of my hundreds of other apps without a hitch. When I mount my Dell Inspiron i7 PC running Windows 10 Pro, I get the appropriate notification with options for charge, file transfer, photos, or MIDI. I tried the Developers USB diagnostic option but failed under this setting as well. Big disappointment. I was planning on purchasing tomorrow as it is the last day of the promo for the free Line 6 transmitter so double disappointment... thanks Line 6.
Perhaps the diagnostic is not compatible with USB 3.0... I was testing on a USB 3.0 port???