Nope, that doesn't work. Marvin is no EPUB editor -- it's an e-reader app. It does give you the convenience of fixing improper metadata for the purpose of Marvin's internal library. For the fixed metadata to be synced back to an EPUB creator software like Calibre, Calibre would have to make that possible by making available an appropriate interface, but there apparently is no such thing.
Quote:
Originally Posted by tsolignani
I would like to edit metadata once and for all.
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Then do it in a real EPUB
editor like Calibre.