Z-Axis does not appear to be working on Ender-3 Pro
It turned out that there's something wrong with the G-code file that came with my printer.

I downloaded a calibration cube from Thingiverse and printed it - while it wasn't 100%, it did print viable. Now I need to get into details as to quality, and I suspect that too will be a factor for the G-code used in the printer. I'm looking at "Ultimaker Cura" to figure out the changes in G-code based on option changes.