I made a little video explaining the other issues you’re having, but I still can’t figure out that Alpha Over node. That one is really tough!
https://www.dropbox.com/scl/fi/0gdpueosg6trkl8vf0op3/Nathi_helping_01.mp4?rlkey=cig2it1p4e1qo695w58w47se1&st=p4e30kkx&dl=0
