It's not clear what you want to do. Do you want to go back to the first image after you've seen the third without any scrolling, immediately?
Like 1, 2, 3, 1, 2, 3, .... etc
For this you can place a timeline action at the end of the timeline and it will begin from the beginning.
Note: This will create a loop.
or 1, 2, 3, 3, 2, 1, 1, 2, 3 .... etc
This one you would need to place the same timeline action but choose continue and tick play in reverse.
no es claro, que quieres hacer. Quieres venir a la primera luego que la tercera ha sido visto? sin desplazandose hacia atras? Immediatemente?
Podria compartir tu documento?