Since my data uploads occur within 2 hrs of the end of my sleep session, they should have been uploaded.
I apparently was able to force an upload by power-cycling my unit off (for at least one minute) and then turning it on. The data became available in MyAir within 20 minutes.
Happenstance or coincidence? I will settle for the fact that power cycling seemed to reset the machine and trigger the upload over the cellular network.