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A single operation to create an asset. Supported asset types are YoutubeVideoAsset, MediaBundleAsset, ImageAsset, and LeadFormAsset. TextAsset should be created with Ad inline.
JSON representation
{"updateMask": string,// Union field operation can be only one of the following:"create": {object (Asset)},"update": {object (Asset)}// End of list of possible types for union field operation.}