I'm a beginner in AE (but I have watched many tutorials on youtube) and I have a question. I drew a polygon filled with a color (ex. blue), then I put the snow effect in it, and then put a tick on "level adjustment" (I think it's called like this, I have AE in another language so I am not sure how it's called in English), because I wanted the snow only in the polygon. All fine until here.
Then I put a background picture and I saw that there is snow in the polygon, but also the blue background color. How do I get rid of the blue background color and have the snow in the polygon with background picture I put as last?