Need to change a paint brush shape into a mask
Simplified problem: I drew and animated an irregular blob shape. I would like to fill the shape with a still or video, using the inside of the shape as a mask. Possible? I could have made the blob using the mask tool instead, but then I wanted an outline around the shape.
Thanks for any advice! - John
(motion 5.4.3 - OS 10.15.7)