I am having the same issue as a person in this old thread. I have a custom enum that resides in one of my action scripts, and it shows up just fine on the action itself, however I can’t choose it as a type for my blackboard enum.
Is the enum public?
Also please make sure to add it to the Type Configuration editor window “Window/NodeCanvas/Type Configurator”
In this window you configure which types you want to show whenever you are about to select a type in a dropdown 🙂