Changing the center point of a shape in Storyline

Is there a way to change the center point of a shape created in Storyline? I currently have a shape with an image fill for a button state. I am utilizing the spin animation for both entrance and exit. The problem arises in that when it spins, it is using the upper left point as it anchor for the spin and because the image within the shape is not a perfect ellipse, the spin animation looks strange. Any thoughts?

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