How do I make a scrollable image inside a mobile screen?

I want to have a mobile mock-up on the website, like this one:

But when I apply the image, it doesn’t scroll inside the mock-up. What am I doing wrong?


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

Can you share a read-only link?

@joejola Here it is: Webflow - Esfera's Superb Site

It’s bringing me to a 404. Did you take it down?