I used a 8GB USB. I don't know why they say 32GB, that's way overkill.
I used the USB port in the center console box.
Know that there is very poor indication of update status. You may no see any message for 5+ minutes.
Just plug in the USB, turn the car on and let it roll for 30 minutes. Eventually the main screen should say System Is Udating or something like that. If your USB stick has a light on it you will see it blink for a few minutes at the beginning while the car copies the data. Until that is finished you won't see any indications.
2017 Ford Focus Electric
2014 Zero S (motorcycle)