SketchUCam Gcode Joining Feature Does not work for me.

I seem to be doing something wrong white attempting to join 2-4 Gcode files. I push Join button, add the 2 files I wish to join. The join feature is waiting for me to add more files, or cancel. If I cancel I get prompted to enter a new file name for the joined files. I get no confirmation, even after waiting overnight, the "new" file ends up 0 KB in size. Am I missing something?

I have read though the help and I think I am following the help notes to a "T". I did not find any forum...

SketchUCam Gcode Joining Feature Does not work for me.