Mac computers will create a “shadow” file (starts with ._ and end with .mp3) for each mp3 file (or any other file) you copy to a FAT formatted drive.
I like to use the Mac utility “HiM” (hidden cleaner improved) to remove all those hidden shadow files. I use the HiM utility after each file management session using my Mac with the internal memory of my Clip Sport and also my micro SD card.
I am guessing your Audi car media player may be getting confused by the shadow mp3 files
Here is a link to the website for the free software “hidden cleaner Improved”.
