/resources/asset.proto,/resources/asset.proto 

--- v20/resources/asset.proto   2025-08-05 14:39:35.000000000 +0000 +++ v21/resources/asset.proto   2025-08-05 14:39:51.000000000 +0000 @@ -201,8 +201,12 @@          business_message_asset = 51;       // Immutable. An app deep link asset. -    google.ads.googleads.v20.common.AppDeepLinkAsset app_deep_link_asset = 52 +    google.ads.googleads.v21.common.AppDeepLinkAsset app_deep_link_asset = 52          [(google.api.field_behavior) = IMMUTABLE]; + +    // Immutable. A YouTube video list asset. +    google.ads.googleads.v21.common.YouTubeVideoListAsset +        youtube_video_list_asset = 53 [(google.api.field_behavior) = IMMUTABLE];    }  }