Local: This folder is currently empty I have no idea what should be here.
The graphics in this folder are either four-album montages or single album covers, the latter corresponding to playlists I have which contain only one album. Generated: This seems to be artwork that is applied to the info header for playlists in Playlists view.For some reason, this folder empties very quickly, even if you’re viewing an artist with such a photo. It’s not clear which artists have these photos many artists who I’d expect to have custom photos on the iTunes Store don’t display such photos when I view their music. Editorial: This folder holds artist photos that display for some artists when you view their music in Artists view.There is also artwork for audiobooks that I have purchased from Audible. I also see thumbnails for some albums that I have purchased from the iTunes Store, and perhaps for albums where iTunes has downloaded artwork. Some of the artwork is for podcasts or iTunes U courses that I have downloaded, some are four-album graphics as used for playlists. Downloaded: This folder contains a number of different items.Custom: Artwork that you’ve added to a playlist, by dragging it to the album artwork in the info bar above the playlist when in Playlist view.Cloud Purchases: This is artwork for items you have purchased that are still in the cloud, and that you have not downloaded.If you don’t have iCloud Music Library turned on, this folder is empty. iTunes downloads artwork from the cloud so it can display this artwork for these tracks. Cloud: This folder holds a cache of artwork for tracks in your iCloud Music Library, but for which you don’t have local copies.This cache allows iTunes to display artwork more quickly than if it had to extract it from your files each time it is displayed. Cache: This folder contains cached copies of artwork taken from your media files.The only app I have that can display these files is Graphic Convertor.) If you see artwork in any of the folders which are empty for me, have a look and see what they contain.
Here is a list of what I’ve figured out so far. Several of the folders are empty, so I’m not sure what they should hold. I’ve looked through the contents of these folders on my two Macs in order to determine what the artwork in each folder is used for. They all contain album artwork, but each subfolder has artwork from a different source, or used for a different purpose. But recently, that folder has added a number of sub-folders. ITunes has long had an Album Artwork folder (in your home folder, in /Music/iTunes), which held a few sub-folders for cached artwork, downloaded artwork, etc.
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