Sorry, I don't have experience syncing files between devices...although, from this page
http://hubpages.com/technology/Best-...ts-Moon-Reader
it would appear that you can backup to Dropbox or Drive, then restore, which includes not only reading position but also annotations:
"How to: Back up or Sync
Backing up was a bit problematic at first. I finally figured out that I hadn't set up the options correctly. Go to your book shelf and open a book. Touch the menu and choose 'Miscellaneous' and scroll down through this option menu to the bottom. The second to last check box says 'Sync reading positions via Dropbox'. Check this option and then touch the gear icon to the right. If you haven't linked to your Dropbox, touch the 'Link to Dropbox' button at the top and give it permission. Then check 'Backup book file to Dropbox' and check 'Update to recent list of new phones/tablets'. Touch OK and then back at the 'Miscellaneous' menu touch the back symbol in the upper right corner. Now, when you go to the options and choose backup or restore, it will simply back up your reading positions/notations and highlights to Dropbox. It doesn't actually back up the books. If you have a book on the tablet but not on your phone, backing up from the tablet and then restoring on the phone will not put that book on your phone."