Hi James,
As far as I know, KM’s Select Menu action does not recognize the contextual menu; presumably, because it is created on demand.
In general for accessing that menu, you find tips in a variety of forum threads, in particular:
- Keyboard Shortcut to Right Click in Mac OS X
- Suggestions on Automating This (Context Menu)
- How Do I Pick an App from ShotBox Share Menu
- Select menu item from context menu?
- How to open the context menu?
- Contextual menu, how?
- Contextual Menu With Variable Length
- How Can I Read the Context (Right-click) Menu?
If you can’t make work any of these reliably, we could also try to write a script for accessing the Share button in a Finder window’s toolbar.