Marvin never modifies the epub itself. Annotations, etc. are written to Marvin's database which is not user-accessible (well, it actually is but you don't want to mess with it).
You *can* transfer annotations, etc. if you use Calibre and Marvin XD, the Calibre connector. No ebook reader but Marvin will be able to use Marvin's annotations, though.
I've not tried sending Marvin's annotations from Calibre to another device.
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