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You probably don't remember these but I have a question
(lemmy.world)
This is a most excellent place for technology news and articles.
No AUX to plug into - only USB
Aux to FM signal adapter, powered by the USB port.
Know that this may not be the safest solution, as you won't have accessible track controls directly from the head unit, so you'll have to be distracted if you want to pause or change tracks.
You are better off with a flash drive.
Then I think you'll have much better luck figuring out a way to get a jack-to-USB adapter to work with your car's radio