I have a Nook, Kindle and two Android tablets. I read my Nook and Kindle books on their respective device (or in the their respective app) and have been using Moon+ Pro on my tablets. I have my non-Nook and Kindle books in Calibre on my PC. Is there an Android app out there that can handle two way synch between two tablets? Moon+ seems to only synch one way - for example if I read on my Tab S3 and then open the book on my Tab S2 the reading position and highlights are synched, but any change on the Tab S2 never synchs back to the Tab S3. Bonus if it could synch bookmarks and highlights to Calibre but I'm probably asking for too much there