The okreal is easy to do check this one out:
http://sidebar-scroll.webflow.io
Preview: https://preview.webflow.com/preview/sidebar-scroll?preview=033e2e6af74e4dc44516632728f7acbb
The Aiga example was what I was aiming for with my first example but couldn’t pull it off with collections anyway.
To have something stick while scroll you need the css sticky property.
More here: position: sticky; | CSS-Tricks - CSS-Tricks
Does it help?