My bad. Below is from the support page:
Auto Awesome movies
You can create Auto Awesome movies from the Google Photos app for Android, which are short films created automatically by editing together the videos and photos you capture around an experience. Choose the photos and videos you wish to make into an Auto Awesome movie, and let Google do the rest. You can change the theme, style, background music, or even remove, shorten, or re-order scenes. After your movie is created, you can choose to share or save it. Auto Awesome movies are currently only available for some devices running Android 4.3 and up, including the Nexus 4, Nexus 5, Nexus 7 (2013), Nexus 10, HTC One, Samsung Galaxy Note 3, Moto X, and Moto DVX.
It only said 4.3 and higher, certain devices only.