If you scroll down, you’ll find more options. You can attribute a Youtube or Vimeo video URL as well as add a self-hosted video to your image. Just add the URL link or upload your video and then click Save and Save&Close.
Moreover, if you’re a photographer, you can add EXIF Information in the Edit section to display data from your image directly into your gallery and lightbox view (a feature available in Modula PRO).
Then, you can add additional options for displaying the video in Settings > Video.