I need a working answer to the question posted here:
Even if I no longer need to specify my material “used with Landscape” I still need some method to make my material appear in the “Target Layers.” Unfortunately my “Target Layers” are completely blank. How do I get my custom material to show up there so I can use it for painting? Here is where the “Used with Landscaping” does not show up: https://i.imgur.com/6X3c6jV.png. I can post a picture of my empty “Target Layers,” but you probably know what that looks like.
edit: solved
I figured it out, and the people of reddit confirmed it.
You can see the various screen shots and thoughts here:
https://www.reddit.com/r/unrealengine/comments/7tgs03/to_make_material_show_up_in_target_layers_of/
The final issue was to switch the default landscape material to the new material I had just made. In defense of my own intellectual abilities, I only hope my next learning experience is a little less dumb.
I know how frustrating it is to search and search and never find a working answer, so I thought this answer should be posted, just in case someone gets as stuck as I was.