Reality Composer and change an object image

Hello, I am learning swift and was building a quick setup using Reality Composer onAction trigger to object change. Basically I want to flip a card resulting in the object image being changed. example: boxAnchor.actions.flipcardA.onAction = FunctionA

I am not seeing this as a property... is there an easy way to change the 'flipcardA' image from a rcproject file?

thank you