Since your Woobox UGC (Photo/Video) Contest does not have a built-in video player in the gallery, there is a “Video URL” field in the form by default.
To enter a video, users must first upload their video to one of the accepted platforms (YouTube, Vimeo, Instagram, or Twitch) and then enter the video URL into that field, or submit the URL via a hashtag entry.
You can enable or disable the accepted video-hosting platforms if you only want videos from a certain source (i.e. Instagram) by editing the Settings of the field.
When submitted correctly and approved, that video submission will display and be playable in the Gallery.
If an entrant submits a video file (under 50MB) to the File Upload button, it will automatically be placed in the “Blocked” tab of the submissions section and the entry in the Entries section will display “Unsupported file type”. However, that file will be available for download in the Export -> Export Uploads section.