Skins import issue!

I don't know if it is an update or if it is a bug but i would want this fixed. I have had minecraft on mobile for years now and I was able to import my own skins into minecraft with no issues but lately these last couple weeks I have struggled importing them in as they say "this is not a skin silly" I don't know if it's my internet but if anyone also have an issue please report it because it has never done this before. I tried using my old skins I have used before and it now says the same thing