My folders dont save

I start my “game” but i have already make a folder with nothing or with something but than i resart it than i dont save all my folders are gone!!! pls help me.

If there is nothing inside a folder UE4 doesnt save it.
If there is a texture, material, etc, etc, inside it it will be saved.

Thats so stupid! If you prep your structure and you cant store an empty folder. WHY?