Yeah, it's an obscure area as most Android devices have SD slots anyway that's why I'm just not getting a lot of info on this.
Interestingly Android 12 on my S20+ (no root) has full read/write access in Calibre Sync unlike 10 and 11. It can open the books from within the app after downloading them. Still having issues with ReadEra, which seems to not be able to differentiate between my external SD and my OTG SD. File picker does, app does not. Returns a path the same as my SD in the slot. So, 12 is an improvement over 10 and 11, but still lesser than Pie which ReadEra handles the difference fine.
You wanna know what's super fun? I've lost write access in Calibre Sync now too on Leaf. That could be because I never had it and I systemized the app straight away (which I think I did). Also super fun, I can't get systemizer to work now either lol.
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