I don't have a SD slot in my 2017 Highlander, but I do have a USB slot, that goes to my radio, I put the music on it, I believe it's just MP3 formats, not M4a, which is apple, don't have a problem running it at all, I put it on random play, so I get a good mixture of what I like to listen to. Hope this helps you.
SanDisk - Ultra Fit 32GB USB 3.0 Flash Drive - Black/Silver
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