Import an unknown format height map exported from umap

I exported a terrain from a umap file using a program called UModel. The output gave me 23 texture files. I’ve never seen a height map format like these files before and was wondering if anyone knew what each of them do and how I can import them into my unreal game. The first texture looks the most like a height map map is not gray scale. I linked some of the textures down below (most of them are just white).