@pinkcookie2777
First thank for replying while I was a sleep for them!
Second, you don't "neeeeed" to Photoshop or Gimp in the texture, as with liltoon specifically (I'm unsure with other shaders, poi cannot) you can just bake it onto the base texture to save on vram space and functions! Its a few extra steps ever time you make a edit to your base texture, but worth it if your concerned with performance. In fact you can see the button to do so inside of your first screenshot right now!
You can even do this with your alpha to be even better with vram! Tho that one gets finicky when working with faces that have alpha'd parts. Personally I'd rather avoid alpha baking.
It doesn't replace your old texture, it opens an explorer so you can rename and place where your want.