Bob, I grew some of them years ago! They are beautiful plants with gorgeous leaves and I would culturwise lump them together with Ludisia discolor, which is not a difficult plant. They are growing on the forest floor in nature, so I would keep them somewhat shady and always moist, but not constantly dripping wet.
Having said that, I find this whole group of so-called Jewel Orchids a touch temperamental, one might be able to keep a plant perfectly happy for a couple of years, see it growing nicely only to kick the bucket for no reason whatsoever. ( in my hands) Many times they come potted up in Sphagnum Moss to keep them moist, unfortunately Sphagnum "goes south" after a a few months and the plant with it. So that is something I would look out for and probably use mixtures of peatmoss and some smaller Orchid bark mix.
My advice would be to enjoy the plants and marvel at the beauty of their leaves, perhaps you might find the perfect way to grow them.