Canvas prevents child scroll view

Hey, I have an UI image that acts as a panel and holds a scroll view component

The hierarchy looks like this:

Image
--- Scroll View
------ View Pot
--------- Content

Everything works and the scrolling is fine.

Now I want to make the Image a child Canvas and control its interactivity and visibility with a CanvasGroup (as per Unity best practice).

As soon as I add a Canvas component to the Image parent object and test it, scrolling ceases - it no longer works.

What is going on?