With the Forerunner 645M, nothing is straightforward when it comes to music if you're on a mac, as I am. Because I have a large music collection--which is stored on a USB drive and all of which has been painstakingly tagged in iTunes, with album art that is sometimes embedded in the mp3/aac files and sometimes in ~/Music/iTunes/Album Artwork--Garmin Express chokes on it and won't allow me to sync anything to the watch.
Since macs cannot natively mount MTP volumes (which is how the watch presents itself when connected), I use a program called SyncMate to mount my watch on my desktop. Doing that I can see in the 'Forerunner 645 Music Media' folder a folder called Music (or maybe I put it there, I can't recall) and in it are folders with artists that I definitely put there and each artist folder has album folders which each contain tracks. So far so good. I'm able to transfer music manually in this way and the music plays from the watch.
That's all great, but I cannot figure out a way to get album art to show up on the watch. It doesn't seem to work when the art is embedded in the files and it doesn't work when there's a .jpg file of the art inside the folder.
So can someone tell me where cover art should be stored in Media folder? Mine looks like the attached. ciq.forums.garmin.com/.../1469379.jpg