Ryan Maloney shows how to animate eye blinks in Adobe Animate by duplicating the eye white, converting it to a graphic symbol with three states (open, mid-blink, full-blink), then using keyframes set to 'Play Once' to generate smooth animation automatically.
Chapters
How to set up eye blinks in Adobe Animate. First thing I do is create a graphic over top of each eye white. You can copy and paste the eye white and break it apart. Change the white to a skin color and make it a full blink. Then convert that entire shape to a graphic, not a movie clip. Duplicate it, then double-click inside. I create 3 frame layers: open, mid-blink, and full blink. In the main timeline, name your layers. Then select the first frame of that graphic and select single frame in the properties. Now we'll create 4 keyframes on the 2 eye blink layers. The frames in between these keyframes will make the eyes blink. Select that first keyframe, tap the graphic on the stage, and then back in your properties, select Play Graphic Once. Paste these keyframes to make it blink