A user is uploading assets for a VRC Efficient reach campaign. According to best practices, what should they include to provide full coverage?

For an Efficient Reach Video Reach Campaign (VRC), including at least one vertical and two horizontal assets ensures full coverage across various placements and device orientations. Vertical videos are crucial for mobile-first experiences like YouTube Shorts, while horizontal videos are standard for in-stream and in-feed placements on YouTube and other Google video partners. Relying solely on vertical videos would miss opportunities on horizontal-dominant platforms, and only one 60-second horizontal video would limit reach on vertical formats and potentially reduce ad variety. Five different vertical videos might offer variety but still neglect horizontal placements. This mix maximizes ad serving opportunities and adapts to how users consume content on different devices.