Problem in skin editing

When you edit a skin, and select anything it doesn't appear, either the body size, Skin type, whatever.
It does not appear, only the default skin appears.
In the images that I attach you can see the error, I give the object again and it is still not seen
Apart from the fact that the skin you choose to be in slim-armed format leaves a very noticeable gap as you can see.
I think it all comes from the error that the skin has in slim-armed format.