So, I go to Tools then Map Maker and each time I try load my height terrain map, the whole game freezes, crashes and has to be closed and opened again. (I assume the same would happen with the terrain mask but I can't really load one without the other anyway.)
This is my first time making my own map, so it could easily be something I'm doing wrong. Is there a specific folder the height terrain and terrain mask have to be saved in? I currently have it saved in the tutorial's direction of FeralHeart > Media > Terrains > WaterMill .
Any help on making this work would be much appreciated

EDIT: Also tried saving it in just FeralHeart > Media > Terrains and it also crashes.
EDIT: Also moved the maps into FeralHeart > Media > Terrains > StarMPack (the name of my map) folder and it still crashes.
Additional info:
Running FH, not FH+.
Files saved as .png
I followed the tutorial's instructions on copying the original watermill file so the height terrain map I created had the same preset size and formats.
EDIT:
Solved the problem. Might want to specify in the tutorials for height maps that bit depth MUST be 8 bits. Some programs *cough Photoshop* auto save it into other bit depths unless you control it.