Fire a Smart Action from an Action Chain

Summary:

Ultimately, we'd like to fire a smart action from an action chain. The reason for this is that there are a few smart actions that we'd love to potentially have custom avenues to invoking them - such as a button in the UI (for users that do not want to type into the smart action bar) or something alternative.

I can create a button, and I can add an event to it as well, leading me to the action chain, but from there I can't seem to invoke the smart action (A UI smart action, such as SDA-CreateTask-opportunities, not even custom)….