Synchronise Kobo glo with Iphone

Hello,

I am French so please excuse my poor english.

I have :
- an iphone (on which I installed the app Kobo)
- A Kobo Glo

I would like to read ebooks on both of these devices so I need to synchronise my bookmarks between them.

But it seems that only officialy bought ebooks can be synchronised by internet, and not those manually added on the Kobo.

Do you confirm ?
If yes, is there a way to do it by an other way ?

Thanks.