Just upgraded to 14.3 on both iPad Pro 11" (2020) and iPhone XS Max.
iPad Pro has no problem opening Marvin 3, everything is working fine.
For the iPhone XS Max, it crashes as soon as I try to open it. Finally got it the problem fix by deleting the app and reinstalling it. However, I've lost all my books after reinstalling Marvin 3.
Luckily, I have a 3 months old Backup (marvin.m3backup) in Dropbox, not as current as I wish but better than nothing.
-- In your iPhone, open Dropbox & find the backup file (marvin.m3backup), tap the "..." next to the file and choose Export.
-- A new popup window will appear and choose "Open In..." and it will get the file prepared to be exported.
-- Once the preparation process has complete, a new window will pop up, you then choose Marvin and the file will be exported to Marvin.
-- A popup window will then show up in Marvin app and just follow the instructions there to restore the file.
The only thing missing are all the settings, e.g. themes, fonts... but the bookmarks & annotations are restored properly and everything is working fine.
Hope this help and also hope you have saved a backup before upgrading your devices.
Cheers
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