It works both ways, as expected. Somehow I thought that the sync was enough, it didn't occur to me that I have to keep the WIFI on when opening the book. I don't see any prompt asking me to choose the current page or the updated one, though (but there's no need for it).
Thank you very much, Taming.
So, Aceflor, at one point the sync was working between the Mini and the Aura, then it stopped. Is that right? Do you use some pluggins or things that can be found in the tweaks thread?