A Live Photo can be made from a video, but this isn't a built-in capability of the iPhone. Instead, a third-party app is required. Alternatively, an iPhone can capture a Live Photo if the camera app is set up to do so. The iPhone’s default setting of Live Auto, however, leaves the decision to an Apple algorithm that might choose to snap a still photo instead. Thankfully, this setting can be adjusted to force Live Photo to be recorded every time if preferred.