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Need help with scroll interaction

Hello, I’m running into problems while trying to replicate an effect I found on a non-webflow website. I’ve tried different options, watch scroll tutorials at no avail. I wonder if someone can help me clarify and understand what I’m missing. This is the original site I’m trying to replicate: https://halogen.qodeinteractive.com/flux/
And here’s my read-only link, I appreciate any reference or link to be able to figure this out, it’s driving me a little nuts to be honest,

https://preview.webflow.com/preview/andresportfolio?utm_medium=preview_link&utm_source=designer&utm_content=andresportfolio&preview=e382d3bf4537d1e70fa5c81c294eed8f&pageId=5ecda367723fd27ab5cf65cb&mode=preview

Thank you,