Auto focus using a TS2 10W

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TwoTrees TS2 20W newbie autofocus confusion

Hi- I am a total noob. The TS2 (10W or 20W) has a z-axis autofocus. I installed the TS2 macros to focus, but I am confused how they work. Specifically, how do I trigger the TS2 to use the probe to autofind the focus point? Wouldn’t that point would be Z0? From there, TwoTrees provide some macros that should be helpful but seem to assume the engraver already knows the point where the laser is in focus at the surface of the object. The first macro is called Z lift 20mm. The gcode for this m…