Layout - Multiple Shots - Overlay

Hello! I’m trying to create a static filter that stays above all layers. My goal is to ensure that the filter is not replicated when the user tries to take multiple captures, to create a layout in a single story.
Example image capture below.

I’ve already tried changing the order of the layers, and it’s not working. Does anyone know what the best way to achieve this result would be? I’m using canva/stack but without success.