Cover art missing in iTunes Match after adding new ones.
I've spent a lot of time adding missing cover art to hundreds of classical music albums that I've ripped from CDs recently.
However, when I pull up the Albums list on my iPhone, connected via iTunes Match, I see some of the new covers there, but many are still missing. I've shut down the Music app on my iPhone and restarted, and it loaded a few more covers, but, many are still missing. I've also forced an iTunes Match update a few times, but, doesn't seem to change things.
I've looked at the file size of some covers, and they aren't out of the ordinary compared to many other covers that are loading just fine, even some with covers that are over 400k in size are loading, while ones that are under 100k are not loading.
Why would iTunes Match not be loading some of the covers on my iPhone and iPad? Anything I can do to fix it other than re-importing all those covers again?