Assistance with creating a Driving Motion Path

I am using Storyline 2 to create a scene which will demonstrate a truck driving up a curvy road. I have added the motion path option to the object and it will move up the curvy road.

My issue that I am having is that my .png truck file will not turn around the curves and the truck only remain static. This only allows the truck object to drive up the curve road sideways. Does anyone know how I can make the truck turn along with the motion path as it curves to simulate a real truck driving up the road. 

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