Animated pop-up coming not from the artboard edge

Hi there,

I created a web page screen for a mobile app (iPhone) with web browser controls visible at the bottom of the screen.
When I use overlay animation to slide from the bottom, it starts sliding from the edge of the artboard (where my iPhone controls are located) instead of the edge of the viewport I created.
Is there a way to set the animated pop-up to slide from certain position on the screen (or relatively: from an edge of an internal group) or it’s not possible?