I use a custom skin in Minecraft Bedrock Edition for Windows 10. Using the skin is not a problem, I can use it in singleplayer, multiplayer with friends, and multiplayer on servers. However, every time that I close the game my custom skin resets to the regular default skin (Steve). 

I've seen multiple posts about how this has been resolved in 1.12.0, however, I'm using 1.12.0 and it still occurs.