Okay, so after several tests I can say for sure that I still don't have the hang of this sync thing

Sometimes it works, but more often than not I have to find the right page by myself.
For those who understand the synchronization process, do you sync from the book, the library, the home screen? Does that even matter?
Do you use the function which is displayed when pressing the wrench (from inside a book)?
Any help is welcome
I'm lost. Maybe I should try and find a user guide somewhere