Machinima Cam in Reach Customs

TL:DR-Please tell me how to use machinima cam in Halo Reach Custom games because I’ve forgotten how (NOT asking about alert carry, I remember how to do that.)

Okay, for those of you who play Reach and take screenshots on it, there’s a way to get machinima cam in custom games, right? Because I can’t find guides for it literally anywhere that I look and I can’t remember the button combo to save my life. One thing I do remember is that it exists and I remember taking screenshots using it. Do any of you know the general button combo/how to activate it? This will be a HUGE help to me and I would greatly appreciate the assistance!

Hold Zoom, Reload, Switch Grenades, and Down on the D-Pad.

Tested in Reach MCC moments ago, screenshot of result below:
https://i.imgur.com/aiurLpC.png

Is that the button combo for entering free cam or lowering the weapon?

Because I know how to lower my weapon/do alert carry.
It is machinima cam I am asking for help with, you know, the free cam like they have in Halo 5?

Sorry, misunderstood - you can do it in theater mode, but as far as I know not in game.