moon+ uses a hidden cache folder for metadata / cover thumbnails [ you can see it if you tick show hidden folders in the moon app preference then browse around ].
it places that as a subfolder within the location specified for " my shelf", which can be in internal storage. AFAIK it does not ever copy any actual books, just reads them from the locations it is given, and creates its own cover thumbnails - you can specify the size of those.
i think it keeps annotations etc in a database of it's own in the same cache location. the fact that moon+ has no user manual is not helpful.
I was separately trying to understand how moon+ handles " my favourities" and how that differs from " my shelf". i used to ignore both of those, but there's a new compulsory overview screen now that shows " my favourites, " , my bookmarks.....
i may just finish all but one of my in-progress reads, then when I am down to only having one book on the device I will tr moving folders around & see what happens
re the A7 fears, CC woudl not become useless, I'd still use it as an on-device library manager, just not ue the " read" function to open books from with CC, but go open them from within the reader app(s) instead
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