You must emboss the layer to give it some height.( If an image is flat, you can’t bounce light of the sides of it.) Then you can create an animated layer by changing the light angle. I use it all the time on my watch hands for highlighting them, so that the light angle reflecting off of the hand appears to stay from the same source as the hand moves. Universal launcher is required to see this effect.
You can see it work well on these hands of my Torpedo watchface…
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