I can't comment on the capabilities of an unknown device that you may buy, in the future.
You might want to look into "Sigil" epub editor. There is a forum for it here at Mobileread. The Glo is supposed to handle GIF; JPEG; PNG; TIFF images, so you can add images. You can use Sigil to add them to an epub.
You might try the alternative reading software.
https://www.mobileread.com/forums/sho...d.php?t=226456
Luck;
Ken