[brudigia]

I am reading sometimes the same ebook on 4 different devices, the desktop app, an H2O reader, and iPad and iPod. I am speaking of Kobo ebooks, bought in the kobo shop.
It usually happens that with the iPAD and the iPod, I get the pages synchronised, and to a minor degree also the desktop app is also in synch. This means that if I read on one of my mobile devices, the desktop app is slightly in delay, it is not completely in synch.
What does not synch is the H2O. I tried reading a few pages on the iPAD, and then synching again the H2O, but nothing shows. The reverse is also true.
Where am I in error ? Is there something to tick, to enable the synching ?

Thanks in advance for the advice.