I ordered the VW MDI USB Adapter from my dealership. When I plug in USB drives the light on the drive activates but the display doesn't recognize it. I've tried two different thumb drives one is usb 2.0 and the other is 3.0. When I check sources the 'Media-in' area is grayed out and non-selectable. I looked through the manual and it didn't address this situation but It did reference the ability to play mp3 files from the USB cable.