Originally Posted by Suzanna
Update - I plugged in my Kobo to see if the sideloaded books were still there and they were. Disconnecting the device (I was going to try rebooting it) triggered a "processing new content" message and all my sideloaded books were visible again. I'm very glad I chose to sign out - saved me a lot of work!
I'm just sharing this here in case others have the same issue.
Have the same problem that you did before. Does your Kobo remember what page you were on for those reloaded sidebooks?