Apple moved books from iTunes to the Books app a few years ago but I think you are asking if a solution might be found within the Books app.
If I strip out the Apple Metadata of an ePub with Sigil, copy that file to the Books app, copy the file to my desktop and then open the file with Sigil I get the extra files warning but only for a .plist file. Apple Books is not creating a cover file named iTunesArtwork.
I didn't expect this to work but thought I would try it. For some reason it doesn't seem that Apple wants to upgrade non-Apple ePubs to Apple ePubs.
The problem unfortunately doesn't end with covers not appearing for non-Apple ePubs in iCloud.
As an alternative, if I view Apple ePubs on my NAS using an iPad File Manager other than Files, I can't see covers either.
So either I can't view Apple metadata or I can't view ePub metadata.
What do ePub publishers do? They are obviously including the Apple Metadata. Are none of them using Sigil? How is that possible?
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