USB Playlists

I have had my 2015 TLX Tech in Basque Red Pearl II for nearly 3 weeks and I still cannot figure how to make/use playlists on the USB audio source.


I tried to manually create m3u files but the ELS does not see them.


I went through Audio Settings for USB and HDD and see that HDD has a playlist option and USB does not.


The owner's manual says you can use playlists in USB. I wonder if this had issues and was removed from the production vehicles.


Any ideas?