I am trying to make a clip zoom in and out after equal intervals on the timeline. I tried doing this using the smart zoom Fx, and then I clicked the animate clock to open the keyframe timeline. I created one keyframe for no zoom and created the next keyframe after a few frames for zoom in. Then I tried to copy the keyframes to paste it after the same number of frames, to repeat the process again and again. But when I paste the keyframe, the previous keyframe disappears. I am also not able to copy two keyframes at the same time.
Therefore, please tell me how I can accomplish this task?