That's what I do. I even had an old iPhone 3G I was going to connect and slide into that nifty little holster under the armrest, but then I couldn't figure out what to do with the cord, which dangled off into the passenger's seat.
Just easier to slap a thumb drive in there. These tiny little HP drives are just perfect, and under 20 bucks at Amazon:
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2012 135i convertible, DCT, Black/Beige, HK, Prem, M sport, no nav.