您的客户想要在三个不同的体育内容发布商处投放自己的运动鞋广告系列，而且，这三个发布商有着各自不同的视频广告素材规格要求。其中一个发布商仅接受 300x250 像素的随播广告，另一个发布商要求使用 VAST 和 VPAID 代码，而第三个发布商尚未发送规格要求。您应当如何投放该广告系列？

The Publisher Spec library in Campaign Manager 360 is designed to manage various video specifications from different publishers. It allows you to upload a single video asset and then transcode it into multiple formats and sizes to meet each publisher's unique requirements, including VAST/VPAID tags and companion ad sizes. This streamlines the trafficking process and ensures compatibility across all placements. Creating only one placement is incorrect because each publisher has distinct requirements. Waiting for identical specifications is impractical, as publishers rarely have uniform requirements. Waiting for all specifications is necessary, but the Publisher Spec library is the tool to handle the diversity once they are received, not just to wait.