Pin an element on scroll

new to BricksForge and trying to replicate some GSAP code in the Forge Panel.

i have an element part of the way down the page which i want to become sticky when it reaches the top of the page, and to remain there while scrolling down. the element should resume its place on the page when you scroll back up…

i’ve added a timeline, trigger element and start has been set, and ‘pin’ checked.
nothing happens unless i add an animation.
if i add an animation in, with no settings as i don’t need anything to animate, the timeline is triggered but it adds a huge space to the page and doesn’t seem to pin anything.

i’ve no idea what i’m doing wrong.
the example in gsap i’ve looked at ( has a scrolltrigger but with no animation.

how do i do this in brickforge?