After reading Nadeox1's post on texture file formats, I understand that main.materials.json is the new standard while materials.cs is its predecessor. However, there is still something I don't get. Putting a materials.cs file in the mods folder will add to the native textures. But, doing the same with a main.materials.json file seems to replace native textures. (which is not what I want) So, instead of overwriting, can a main.materials.json file in a mirror folder append?