You can upload a video when creating a new ad, or come back and edit your ad to add it later.
To upload a video to your live ad, go to Edit Ad and click the "Add your own YouTube video" option, or paste the YouTube URL into the "Optional YouTube Video" field on the Place Ad screen.
Please note that if the video is a YouTube short, you will need to change the section of the link "shorts/" in the URL to "watch?v=" in order for it to work.
For example:
Original Shorts link:
https://www.youtube.com/shorts/abc123
Change it to:
https://www.youtube.com/watch?v=abc123
The option to upload a video is currently unavailable on the DoneDeal app, so please use a web browser or mobile web to add your video.