It’s super easy:
Plug your USB into your car. You’ll find the input at the bottom of the Tesla screen.
Tap on the navigation setting on your screen, it has the Tesla car icon.
Head to “Controls,” then to “Safety and Security.”
If you scroll down a bit, you’ll find the option to “Format USB Device.”
Then confirm the operation by tapping on “Format.”
Once that’s done, your USB will be formatted for usage!