In addition to Jon's fix, Updox also has a newer Print to Inbox thing that you can try:

https://help.myupdox.com/help/how-to-install-and-use-updox-print-to-inbox

It adds another virtual printer called Updox Printer to your computer.
It seems to rely on Updox central in some different manner than the shared printer you described.
I saw it recommended on Updox's portal and it works fine for us.

Josue
Tampa, FL