Unable to run driver Action

This? https://docs.hubitat.com/index.php?title=Driver_Capability_List#Actuator

It has neither commands nor attributes so it's really unclear what adding that capability would do. Or is the purpose of that capability just so it's available in this menu? If so, it should be written there...

I'm positive there's a mirror in mirror, self-referential catch-22 joke available but I can't seem to pull it up right now.