Any videos you wish to include in the chapters of your book must be embedded. To embed a YouTube or Vimeo video, select the "Tools" option in the WYSIWIG editor. Under tools, you can select either a Youtube or Vimeo video. If your video is from Youtube, enter either the Youtube ID or the URL and the resolution type. If your video is from Vimeo, enter the Vimeo ID. Press submit, and your video will be embedded in the chapter of your book.