How do I Embed YouTube and Vimeo videos as Custom Links?
If you're trying to add a video hosted by YouTube or Vimeo as a Custom Link, you may find that when you choose to have the video pop up in the Tour Player, you receive an error stating "Custom Link 1 Url Unbranded won't display in a popup window because the host disallows it."
If you want to get the video to open in a popup box, you have to scheme the URLs so they are using the embed links of the respective services. The embed link is generally contained in the embed code. For help with finding the embed code, we recommend seeing the help documentation for each service.