Saving Bookmarks in PDFs using Preview / Books


Can any of you get this to work? I have a PDF that is writable. I "add bookmark" and it shows up just fine. I save the file. But when I close and reopen the file, the bookmark is gone. Is there some trick to it maybe? This is true for PDFs in the cloud (Books) as well as those saved locally.

Ultimately I'd like to be able to save bookmarks in PDFs stored in "Books" so I can find them on my iOS devices.