Material

{

  // Union field material can be only one of the following:
  "driveFile": {
    object (SharedDriveFile)
  },
  "youtubeVideo": {
    object (YouTubeVideo)
  },
  "link": {
    object (Link)
  },
  "form": {
    object (Form)
  }
  // End of list of possible types for union field material.
}