Figma constraint VS responsive prototype

Hi everyone,

The problem i’m facing is that if I use constraints in my design it seems they aren’t applied to the prototype.
I did a simple design with a header fixed on top and a footer fixed to the bottom and in between a content zone with a top and bottom contraint.
If I scale my main frame in Figma, no problem : the height of the content zone follows, if I do the same with my prototype : the height of the content zone seems to be fixed.
A a result, depending on the resolution of the device I’m testing on, my content can be croped.

Is there any workaround to do this ?

I can’t attach a video to illustrate this because I’m new, but i will as soon as I can.