Sorry, i don't know what the name of that square that's behind the gameplay inside the skins folder, because of this i'm coming here to ask about. I wanna add there in a skin i'm edditing.
https://prnt.sc/RAWQy8HVK4wt
https://prnt.sc/zVl3mp2Ar4FH
https://prnt.sc/RAWQy8HVK4wt
https://prnt.sc/zVl3mp2Ar4FH