So I recently had to have my MFD replaced in my 2013 S.
With my old MFD, I would get consistent "loading error" messages when playing music (.m4a files) off of various USB sticks. I had to rip all of these files to .mp3 files and then load them on my USB stick before my S would play the songs on the stick without "loading error" problems. With the old MFD, I got very occasional album art.
With this new MFD, I put all the original .m4a files back on the USB stick (and only the .m4a files, no folders or anything) hoping these types of files would work better, and with this new MFD hardware it now plays .m4a files without "loading error" messages. And for the observation........now I am getting album art for almost all of my music? I thought that was pretty weird, but I'm glad it (mostly) works now.
With my old MFD, I would get consistent "loading error" messages when playing music (.m4a files) off of various USB sticks. I had to rip all of these files to .mp3 files and then load them on my USB stick before my S would play the songs on the stick without "loading error" problems. With the old MFD, I got very occasional album art.
With this new MFD, I put all the original .m4a files back on the USB stick (and only the .m4a files, no folders or anything) hoping these types of files would work better, and with this new MFD hardware it now plays .m4a files without "loading error" messages. And for the observation........now I am getting album art for almost all of my music? I thought that was pretty weird, but I'm glad it (mostly) works now.