I came across a video that teaches kids how to draw. I recognize some kind of masking is involved, but I can't quite figure out how to do this in photoshop to create animated drawing. I know for sure the letters are pre-drawn in Photoshop (or some software), but I can't figure out the animation.
Here is the video I was referring to: https://youtu.be/ayzVNkIJsk8?t=31 (warning, there's kid music).
Thoughts? If this is the wrong place to ask let me know, thanks.