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Triggered Parallax scroll, stop then resume?

Hi guys,
New to Webflow.
I want to make a parallax mask scroll effect where mid-page, the mask is triggered to stay fixed and the image underneath continues to scroll. I have seen it on Apples product pages a lot. The overall design is the mask will be shaped like a computer screen and the image underneath is an example of a web design page.


Here is my public share link: LINK
(how to access public share link)