" Full 5E compatibility " and " easily integrated into any 5E setting " the Roll20 EG core manual advert promised. So, I bought the Esper Genesis compendiums expecting just that, to add to my running D&D 5E campaign. Imagine my disappointment. For now, I've solved this problem by either picking the 'D&D 5th Edition' or 'Esper Genesis' system under 'Compendium Settings'. After you're done, switch settings back to whichever compendium you prefer during actual game play. It's a hassle, but this seems to me the best way to import items and monsters from either compendium. This is certainly not what I'd expected after reading the advert...