Please refer to the following link
I want the clouds to make an infinite loop even after the frames ends. Also I don't want to have any continuity issues after the cloud set passes for first time (No breaks)
Move the entire animation to a MovieClip symbol and drop that on its own layer on the main timeline. Then, when the main timeline ends (with a stop() action on the last frame) the MovieClip with the cloud animation will continue to play and loop on its own timeline.