We use video or images as prompts to Foldback and not necessarily to the front of house using Black Key to hide if not needed. Sometimes, like Christmas, we would display an appropriate picture whilst the children are acting in a Nativity play e.g. a Starry Night. This has all ceased now when using Alternate Output as there is no way to show an image or video because you can only use Themes with, songs, scripture and presentations and not images or video. If we use the Black Key it also blanks the cameras which we don't want so we are finding that the Alt Output, although useful for some purposes has caused other issues.