Volvo USB input won't recognize flash drive?

I rescued abandoned company trucks & haul freight back to a terminal & then hitch a ride home in another company truck.

I've only been in one of these newer Volvo's before, as a passenger. While riding shotgun, I had an extra USB thumb drive & ended up loading it with MP3's and giving it to the driver. It worked in his Volvo.

I just picked up one of those newer Volvos this weekend & I just grabbed the thumb drive out of my car but it said "Unsupported USB" on the stereo when I plugged it in. It was a long miserable 60 miles home without tunes.

And now I'll have to be in that truck for at least 4 days with just FM radio to listen to.


In that other truck, I arranged the files in sub-folders like this:

Root > Artist > Song.mp3

That's also how it's arranged on the one I tried in this one that didn't work. I just plugged it into my laptop to see if somehow static electricity or sweat or lint or something from being in my pocket all day Saturday had ruined the thumb drive but it works fine.

Any ideas?

I'm not sure what year the truck is. It's 2013 or newer I'm guessing, based on the fact this company was 100% Kenworth as little as 2 years ago. (They switched to Volvo's with Volvo engines because the Cummins with DEF systems were too unreliable & they didn't like the 4 Detroit-powered Freightshakers they tested)

 

The one I tried is 4 GB.

Same size as the one I gave to that other guy with the same kind of plastic Volvomatic rookiemobile as this one.

It's alright though. FM works good enough for the short term. I'll be out of this thing when it's regular driver gets back from vacation next week.