I while back I tried downloading some custom uniforms into my game. I went in-game and opened the EUP menu and equipped the uniforms I installed, but when I equipped them, I noticed that the uniforms were the same as the base-game ones, and also that some of them had a missing texture error on them. It doesn't only do it with custom uniforms, but when I tried installing EUP vest & earpiece, the vests and earpieces didn't even show up in-game at all. I watched a whole video on how to properly