Thanks for your infos! It seems as if I have a similar issue as yayo experienced. I think I opened the epub with the other Reader first and then switched to Coolreader. (I don't have this problem with other epubs I didn't open before).
I tried to solve this problem by duplicating the old epub under another name - same probs. I can make bookmarks - when I close the epub und open it again they're gone. Strange thing is when I'm in the book folder the preview icon of the epub shows a position in the text and not the book cover. But when I open it goes back to the book cover. A bit annoying, but I'm glad it at least works with other documents.
PS: I only use the internal storage.
Anyway, thanks for your help!
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