UR44 to ScreenCast

Hi everybody!

I’m trying to record my UR44 outputs to a screencast software but I can’t find a way to do it. Here is what I’ve got:

Macbook Pro running High Sierra 10.13.6
Logic Pro X
Quick Time Player

So the idea is to record Logic and my mic to do a simultaneous voiceover/walkthrough of one of my projects. However when I select Steinberg UR44 as an input for Quick Time Player Screen Cast it only records the direct inputs and it records them hard panned to left or right.
What I want is to select Output 3-4 of my UR44 (for example) as an input to Quick Time so I can record everything that is coming off from it incluiding Logic and my mic.
Anybody can help me out or give me an alternative?