某家電腦配件零售商決定在串流內影片廣告活動中，新增 640x480 MP4 影片廣告刊登位置。 他們該如何透過 Campaign Manager 360，將這個影片格式和解析度選項加入廣告活動？

To add a specific video format and resolution like 640x480 MP4 for an in-stream video ad campaign in Campaign Manager 360, you must enable the relevant option in the transcoding list. This allows Campaign Manager 360 to process and deliver the video in the desired specifications for the publisher. Enabling all transcoding options is unnecessary and can lead to larger file sizes or formats not supported by the publisher. Providing new tags to the publisher is not the first step; the video format must first be configured within Campaign Manager 360. Simply uploading the video file is insufficient; you need to specify how it should be transcoded and delivered.