The Kemble pack is 20 original stickers drawn from the Kemble mark — hello, celebrate, thinking, thumbs up, coffee, shipped, high five and more — animated with the brand’s own motion. The Fluent pack is 36 of Microsoft’s Fluent Emoji 3D pictures, under the MIT licence, credited in Settings › About and on the website’s legal notice.
In Kemble Circle the Stickers tab has a button for each pack beside the community’s own stickers, and one search covers them all. In Kemble Work the emoji picker in the message box has a Stickers tab. A sticker is sent as its own message, follows your sticker animation setting, and is named in pins, notifications, replies and forwards.