In the brief clip, Markle can be seen admiringly stroking her silk tulle wedding veil hand-embroidered with the flora of each Commonwealth country and saying, "Fifty-three countries, oh my goodness".
Harry is seen in the documentary joking with visitors that he panics when he stumbles upon the Queen.
Speaking to the new recruits he says: 'Have you bumped into the Queen yet?
It also offers glimpses into the royals' everyday lives, including the moment the Duchess of Sussex saw her completed wedding dress and veil ahead of the royal wedding.
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"I'm so excited to see the projects you're going to continue to do in your own community, the community at large, and also how you're going to inspire people globally by sharing your stories and your recipes", she said at the event.
Meghan is joining Harry as a Commonwealth Youth Ambassador as part of her royal duties. "It will keep us busy", as she admires the incredible embroidery on the dress.
However, although she's not an official member of the royal family, there are talks of Doria moving from her home in California to be closer to Meghan in the UK.
Filmed over more than a year the documentary makers were given access to private home movies and the programme shows the role played by the Royal Yacht Britannia in the Queen's early tours of the Commonwealth. Starting with next month's trip Down Under, am I right?! "That, I believe, is the ethos of Together", she said. "I know you do".