Is your Auto Awesome on? In Photos, tap menu, then Settings, then your account name, and make sure Auto Awesome is checked on.
Auto Awesome movie generation isn't under the user's control--Google+ will analyze your photos and, based on some magic algorithm, will determine if a series of photos would be good for an Auto Awesome Movie or a Story. I've gotten one or two movies and stories, but they don't occur frequently.
Try uploading a number of closely related photos (like vacation photos) into the same folder, or photos that are clearly sequential.
I understand, but in Photos you press the "+" button and could normally make a Movie, Motion or Mix. "Movie" is missing.
Movie is back!!
Moto X 2nd Gen