Promotional videos are the best way to show clients your work and creativity. They can be videos of previous collaborations, videos that went viral, etc...
To add promo videos to your profile,
Go to the "My profile" section
Scroll and click on "Promo Videos"
Click on the "Add promo video" button and paste your Tiktok/Instagram video URL
To remove a promo video from your profile, simply swipe left on the video URL and click "delete".