On FurList, you can optionally upload a YouTube video to your listing, showcasing the product in a video and shows up in the Images section of the listing.

To add a video, upload your video to YouTube with it being set to Public or Unlisted
Get the link for the video and when creating your listing there will be a video option in the images section where you can input and preview the video.

Videos can be changed afterwards in the edit listing part of the dashboard.