I often read my epubs from different computers and with different apps. When I travel I use iphone, when I work I use the office PC with windows, when at home I use my Linux pc, and when in bed I use my android tablet. Four different apps on four different OSs, but each app has its own bookmarks system, and I always lose my reading marks and spend time searching through the pages. Is there a way to store my bookmarks inside the .epub file and read those in any epub reader app and os?