Veo 3.1 and more artistic control in Flow

Product Updates - Veo 3.1 introduces richer audio, more narrative control, and enhanced realism [1] - Veo 3.1 builds on Veo 3, with stronger prompt adherence and improved audiovisual quality for image-to-video conversion [1] - New capabilities are introduced, bringing audio to existing capabilities for the first time [1] Technology - Veo 3.1 is state-of-the-art [1]