No connection to network drive MacOS 10.15 (Catalina)
I was able to resolve this (temporarily) by restarting my Mac. I later discovered that I could restart the Finder to resolve it. Apparently the Finder app is responsible for network connections for other applications too.

While this does not prevent the reoccurrence, restarting Finder is a minor inconvenience. Hopefully this is a bug that Apple will resolve.

How to Relaunch the Finder


Hold ⌥ while right-clicking on the Finder dock icon → Relaunch
Open  Menu → Force Quit → Finder -> Relaunch