I am getting up to speed, have engraved  a  few test boards' traces, am ready now to integrate drilling and milling out the board....
The drill nc file looks great, but haven't run it yet....but despite checking the box to have a mill file generated, which I assume is the file to cut out the board's outline in the dimension layer, the code consists of the following:
G20
(Absolute Coordinates)
G90
G00 X0.0000  Y0.0000  
M03
G04 P1.000000
G00 Z0.5000  
M05
M02

That's all I get every time.  What am I doing wrong?
Thanks for any input....

May have found an answer...change the outline (default dimension layer) to layer (Mill)  46?