Make sure you put the newly textured item in the items.cfg file within your FeralHeart folder. I will show an example:
Say I wanna make my own antlers, so here is the default antler code.
[Aged Antlers]
mesh=antlers.mesh
material=antlersB
bone=forehead
offset_f=0.1 1.5 0.5
rotation_f=-10 180 0
offset_c=0.1 1.4 0.1
rotation_c=-40 180 0
I will copy and paste that, only editing the material.
Within my items folder, I have the material file, name, and texture to go along with it. If you make your own material file, you can make a .txt document and rename the abbreviation to .material. I would recommend using the same material for the item, only changing the material name and of course the texture name as you see fit.
So, I make a new material file for the antlers. I name it myantler.material. I open the original antler file, copy the material code and paste it into the myantler.material. I change the texture to my own custom texture, name it MyAntlers. Now, I go back to the item.cfg and copy and paste the antler default code.
[Aged Antlers]
mesh=antlers.mesh
material=antlersB
bone=forehead
offset_f=0.1 1.5 0.5
rotation_f=-10 180 0
offset_c=0.1 1.4 0.1
rotation_c=-40 180 0
I change antlersB to MyAntlers, which was the name within the material file. Not myantlers.material, MyAntlers.
Make sure that the textures, materials are all in the items folder. This is essential, since FeralHeart isn't able to find it without editing the directory/reference code. ^_^