Hey Gabe,
Hazel is down till updated for Catalina. Time to experiment!
To use this Switch/Case trigger to file docs moved to the desktop what variable do I use in the Move/Rename Action? I tried %FinderSelection% but I guess the Switch/Case action isn't actually selecting anything and/or %FinderSelection% is the wrong variable. The readings in the wiki for Switch/Case and TriggerValue are above my current pay grade 
.
The next issue looming will be when the file title won't work and I'll need KM to parse the file (typically an email of PDF) to get a value to act on.
Hazel's Contents/Content Match has be good about reading most anything I throw at it and I'm guessing KM will need more from me to read variously formatted docs.
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Found this:
JMichaelTX
ash:
Perhaps the Reveal File action has changed behavior during the last 4 years.
It is not the Reveal files that has changed, it is the token %TriggerValue% , which used to return only the file name. Now, as you have learned, it returns the full POSIX path.
So maybe the variable in the Move action needs to include the name AND path?