So the only thing I’ve found so far after running a couple of programs (in the air only), is that the “6-external include files” section doesn’t open a dialog box to select a file for start/end/probe/toolchange.
But it does allow you to just put the name of the file if it’s in the same folder as the post processor, or output. I’m not sure of how that works though.
I used the GRBL settings in metric and am running fluidnc on a Jackpot board on an MPCNC Primo.