Users searching for jpg to elb conversion are in most cases actually looking for options how to use JPEG pictures to either make new Adobe Photoshop ebook (.edb) or to just add more pictures to it. There is no reason why this should not be possible with Photoshop, but there are no particular useful sources of information about this subject on the Internet. So if you need help with .edb files, it might be best contact Adobe support or perhaps online user community for help.
Updated: August 9, 2023