No iBooks PDF Bookmark Sync..??!

Hi and tnxs for reading.

A similar post was submitted some years ago.

No OSX has changed to El Capitan, but the issue is still there.

Everything is up to date.

I have a lot of PDFs on my iOS devices and on my Mac, everything is on iBooks.

When I stop reading a PDF on my iPhone and open it on my iPad, it automatically goes to the last read page: everything is kept synchronised.

However, although my iBooks setting on my Mac are selected to ON, here the sync is not working.

Any idea for a solution please?

Tnxs, Cheers.