UI not receiving input while using Multi-display feature

Hello,

Currently, I have an app that makes use of unity’s multi-display functionality, Display 1 just plays a video, and display 2 has UI buttons that make different videos play in display 1.

I have the canvas that contains the UI buttons set as camera space canvas, and the camera that renders it, is set to display 2. As soon as I do this, I can’t click these buttons? Graphically they are on display 2, but if I click in the same spot that they would be on, in display 1, it receives the input.

Any tips on fixing this? Using Unity 5.5.2

A lot of people experience this issue. I’ve tried to get feedback but haven’t head back in a while.
https://forum.unity3d.com/threads/5-3-multi-display-feature-issues.372604/page-3#post-2977861

Up that thread links a few related bugs others have filed