Custom Enemy

This problem is not bug probably, maybe it is my dumbness.

I use MC 3D skin and create my enemy skin.

Create new file (RMB) and in this file new file (RMB) with name of my first dimension i work on. Into this file I save my skin. But when i click on import in MCretor, I have no skin availible.

MCreator is for Minecraft 1.12.2

Thanks for help