I have multiple documents that have connections with custom properties(of all varieties: headers, text, protected, etc), and the "CustomProperties" and "CustomPropertiesList" properties appear to be empty, and it's not clear how to get it to display/how to add to it.
just to let you know. We've updated our PowerShell module (available through the PowerShell Gallery)
and included the following cmdlets:
This is currently not possible but we will add this in one of our next releases.