You said “make the overlay small”, I didn’t know you meant spinning.
@overlay OVERLAYNAME rotates # anchor point x x in T
Rotating an overlay depends on it’s anchor point:
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anchor point 0 0 is the bottom left of the overlay
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anchor point 0.5 0.5 is the center of the overlay
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anchor point 1 1 is the top right of the overlay
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# is a number between 0 through 360 (like the degrees of a circle)
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360 turns the overlay all the way around, which turns it back to 0
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180 makes the overlay upside down
After rotating it, you have to loop it so it spins: