The "highlight" icon in the top means the picture or video will be more likely to show up at the top of your gallery, or in the randomly generated 30-second mashups that the Zoe software creates. Highlight or unhighlight a file by tapping the star.
For clips shot in Zoe mode there are extra editing options. For example, a sequence shot combines several frames from the video to give you a stage-by-stage action shot. Select from five frames you want to include along the bottom of the screen.
Here you can see more Zoe retouch options. "Always Smile" detects faces and lets you cycle through every individual still for each face in the photo, while "Object Removal" makes a guess at people or objects in frame that you might want to remove. Expect mixed results when using this particular tweak.
The phone makes 32-second clips out of your photos and videos, editing and picking snaps to include at random. You can shuffle the video until you're happy with it, and apply some attractive filters that come with a musical accompaniment. Video wizards may shun this slightly cheesy feature, but it's a great way of getting a bite-size overview of a holiday or day trip, and it's dead easy to share on Facebook.