Under the Unit actor is the Actor: Portrait Actor field. This links to a Portrait type actor. Make a custom Portrait type actor and adjust the events so that it plays the animation when you use the ability. Make sure the model used for the portrait has the correct animation.
Rollback Post to RevisionRollBack
Contribute to the wiki (Wiki button at top of page) Considered easy altering of the unit textures?
If adding the event directly to the portrait actor does not work then set the portrait up to use Signal events and your Unit actor to send the signal to the ::PortraitGameSelf system reference. Else do like Vikings and send the event action directly to that reference.