Follow the few steps:
https://docs.appspace.com/signs/5.5/user-guides/widgets/standard-widgets/media-zone-linking/
Dimensions of Playlist:
1703 pixels wide by 958 pixels tall
Here are the settings you need to select to link the Main Campus Playlist:
https://docs.appspace.com/signs/5.5/user-guides/widgets/standard-widgets/media-zone-linking/
1703 pixels wide by 958 pixels tall