I want to create a hacked shirt

Like this one
https://www.youtube.com/watch?v=6-Bwt71OiXw

That was a roblox vulnerability. I think you can only upload jpeg and png


Also, trying to upload a glitched shirt and looking for support on how to preform said glitch in the SUPPORT SUBFORUM is the dumbest idea I’ve heard. Sorry g, but your YouTube stardom will have to come from elsewhere