A follow button animation is a short clip of a Follow button being tapped: a profile chip with a username appears, a fingertip presses Follow, and the button changes to Following. Creators lay it over a video at the moment they ask viewers to follow, so the ask is seen as well as heard.
This maker builds one around your own username. The avatar is a disc with your initials, both of the button's texts are yours to type, and one accent color runs through the button, the avatar and the tick. Choose the compact pill, or the profile card, which also shows a follower count going up by one.
Before you download, put the chip where it won't cover your face or your captions: Position, Alignment and Size set that here. In a 9:16 frame the chip keeps 14% of the height away from the top edge and 20% away from the bottom, because apps cover those strips with their own captions and buttons.