@kylezz241 yeup just to your images folder go one folder back and make an .iwd file than put inside it the mw3 .iwi background menu image file which should be named something like this
https://forum.plutonium.pw/topic/46525/dark-soldier-background-mw3?_=1792237708035
if it didnt show up just replace the plutonium made .iwd file that has replaced the og mw3 background