In Publish after generating an epub which is opened by Adobe Digital Editions one is presented by a dialogue box which says: "[ebook name] is not open from library, would you like to copy it to library?" Underneath this is a tick box which says "Don't show this alert again". However, there are only two options: Copy to library or Cancel and the dialogue doesn't remember the choice if one selects "Cancel".
So, my only option is to Add to the library?