A PC accessories retailer has decided to add a new 640x480 MP4 video ad placement to their In-stream Video campaign.In Campaign Manager 360, what step should they take to include this video format and resolution option in their campaign?

To ensure a specific video format and resolution like a 640x480 MP4 is available for delivery, the retailer must enable the specific option in the transcode list because Campaign Manager 360 does not automatically activate every possible resolution upon upload. Transcoding is the process of converting a primary source file into various smaller "renditions" optimized for different bandwidths and devices; by manually selecting the 640x480 MP4 specification within the placement or creative settings, the system generates that specific file version to meet the technical requirements of the publisher's ad player. Without checking this specific box, the ad server may only serve default or incompatible resolutions, potentially leading to errors or poor visual quality on the site.