I have had my Moto Z Play since Xmas. Now I want to transfer some music over to the phone. I bought a USB A to USB C cable but when I plug it in neither the PC or phone seem to see each other. In the phones HELP files I see the transfer via USB info but it mentions "swipe down and change the USB usage type". I take it they mean from Charge to Data. I do NOT see that box or any link to changing the USB function. Did I buy the correct cable?