How to fix UIScrollView not scrolling in .xib issue?

Question

I have this project that requires to add UIScrollView. I followed this Tutorial since it is my first time to use UIScrollView. But unfortunately, it is not working successfully. My scrollView is inside a .xib. Please help me fix this , aside from first time to use UIScrollView, I am not familiar with do's and don'ts in it. Also, been working from this for almost a week now. And to add some information, I removed the constraints in the objects inside ContentView, because even with or without constraints it is still not working.

This is my current setup

This is the setup from ScrollView to UIView

This is the setup from ContentView to ScrollView