Issues getting PBR materials to work on custom map

I wanted to make my own map, but I'm already stomped trying getting materials to work. I read a lot of the documentation, watched multiple videos, read threads on this forum, but I cant find a solution. Everything stays black, save for the foliage on grass-materials.

All the materials have a base, normal and detail texture assigned, the base mapping scale adjusted, I've added the details to the main.materials.json and the terrain.json.. I don't know where the problem is. I even tried creating a simple base texture myself, but that didn't so anything either.

Also, the drop down "Edit TerrainMaterialTextureSet Properties" doesn't show anything for me to edit.

What am I missing?

Edit: I'm just gonna use a map as a template that already uses PBR materials, instead of the actual template map as a work around.