Quote:
Originally Posted by pwalker8
Hum, that's odd. I have an iPad Pro and iPad mini with Marvin, both with the latest and greatest iOS. No problems syncing. One possibility is how you get the book in to Marvin on the two devices. I had a similar problem several years ago (2016 when Marvin 3.0 came out) and basically, if I recall correctly (it has been a while) the way Marvin creates the hash values that it uses to sync can differ if the book is imported into Marvin differently. You might try as an experiment, load a book into marvin on one device, scroll a few pages and then sync. Then load the exact same book into marvin on the other device in exactly the same way, sync it and see if you see the other device. I typically only see one device unless I've synced the same book on both devices.
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Hash value is just md5 checksum (I investigated the m3backup file that Marvin 3 generates for backup/restore).
If the files are binary identical (e.g. copied via Dropbox), then they should be recognized as the same book.
Alas, if these were transferred via Calibre OPDS server or Calibre Companion for example, they could differ since Calibre updates metadata when sending books to devices (ergo modifying the EPUB and checksum). It's possible that the same book downloaded at two different times (say 2 months apart) from the Calibre content server would have different checksums.