Casey why

I'm having the same issues, I've used gimp, canva, and a second party sketching app to test all recommended color combinations. I've got the naming down, File types correct( I tried both png and bmp) and so far the only color that the editor recognizes is the full forest. I've taken colors from images, pull hex# and RBG 8bit nothing seems to work. Does anyone know if the colors have changed or if there is a place I can pull the correct colors from in the tilezed file?