So, I tried using a PNY 126GB Flash Drive and guess what? It works! Evidently, the issue is with the SanDisk 256GB drives that throws the Tesla system off. I am disappointed though that the Tesla system only allows you to stage/play your songs alphabetically. I tried to force the play order by numbering the songs 01..n but it still plays the songs in alphabetical order. Another issue is that it does not remember where a track was left off or which folder I was in. When you restart the car, the USB music starts back up from scratch! What a shame that a car with so much automation lacks such basic music playback capabilities!