When a Spirit with an Incarna adds Presence, may it add its Incarna?

When a Spirit with an Incarna adds Presence, may it add its Incarna?

Yes, but only to reposition an Incarna already on the island. If the Incarna is not on the island, it doesn't count as Presence, so it can't be added by an action that adds Presence.
The Incarna is considered added even if it's repositioned back into the land it came from. (It's not considered moved.)