Frame 1 to frame 2

Hi, first post here.

I am designing a tween mask mosaic animation with 1 picture on frame 1. My customers now ask me to add a 2nd mask animation with a second picture.

I used a button to go to frame 2 and play the movie clip. He doesn’t a want a button.

Can anyone help me play the movie clip on frame 1. Once the movie is over goto frame 2 and play the movie clip.

Thanks