Why can't I add a ScrollView to a StackLayout on iOS?

I am working on a project, and am trying to nest a ScrollView inside a StackLayout, and when I do this, the ScrollView does not appear. for example: I have a logo at the top of the page, and below it, a ScrollView for a series of buttons for the user to interact with. However, the scroll view does not appear, but if I remove it from the stack view, and add it directly to the page, it appears just fine.