Do any of you people know any good apps for adding custom backgrounds with green screens for Stop Motions?

Dinosaursandanime65

Sometime this year, I’m gonna get my Seraphim and make a stop motion with it, and I want to add a background filled to the brim with clouds moving like water. Hayllp?

Do any of you people know any good apps for adding custom backgrounds with green screens for Stop Motions?
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