I download over wifi using the Calibre Companion app. The books sit within this app on my iPad but I choose to use iBooks from within there to read them.
I had thought they would always remain in ibooks once opened in there but now when I am out of Wi-Fi range the books within iBooks lose their covers and the cloud symbol returns against them. Once Wi-Fi is restored I have to tap everyone to make them available in iBooks again.
I am almost certain this was not an issue until updating IOS to 15.3?
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