Minecraft Xbox 360 Edition Custom Skins

Hello,
I'm trying to figure out how to use custom skins in Minecraft Xbox 360 Edition. I have already gotten very far, since I
bought a skin pack I moved it to a USB and used Horizon to extract the .pck file. I used Ravioli Game Tools to explore the
.pck file, it has all the skin packs I bought, and I want to change one of them, I do know how to export skins, but I don't
know how to import the edited skin.


Please let me know if you have a solution to import png images to a .pck file.