You have to apply this settings on the main RGB => And choose create layer from visible objects.
3. Apply to both of the newly created layer the alpha mask (green top, red on the bottom)
6. Merge them all together, delete all unnecessary layers and export you _n file.
Additional note from AmberJay if you experience bugs with the lighting:
"So, i basicly just duplicated the rgb layer, increased the contrast and saturation, plus moved the hue towards blue on the top layer, then set it to 33% opacity. No changes to the bottom layer. Now it looks much better, still not perfect, but i think it's as good as it gets.