Can't import a custom skin

So. I wanted to import a new custom skin into Minecraft to use on a new realm. For this i used an editor that never gave me trouble beforehand (skin editor 3D), but, as soon as i tried to import into Minecraft get the notification that "it needs to be png, dimensions either 64x32, 64x64 or 128x128" (picture). Now, obviously first thing i did was checking the requirements. The file i used is indeed a png aith dimensions of 64x64. I also tried some other Editors and to import my old skin, but every time i get the notification.

 

Now i reinstalled Minecraft, hoping that would fix it, but no. Now my old skin is lost too. I also checked if everything that needs to be transparent is, and yes. It is. I also tried versions of the skin with and without overlay. Both don't work.

 

It's a bit frustrating and i hipe it gets fixed soon