Webflow - As you scroll photos change

Hello, I am trying to figure out how to apply a scroll feature that as you scroll through a number of steps on our case study page, the picture to the left then changes to reflect each one of the steps.

Here is a link to the page that is live now.


You should be able to see what I mean as you scroll on desktop. The picture is fixed to the left side and when you scroll I want the picture to change with each step 1-4. Let me know if that makes sense.

I will attach a couple of screenshots below as well.

Here is my site Read-Only: LINK
(how to share your site Read-Only link)