Custom Emoji. Premium users can include unique animated emoji in
messages and
captions to add even more expression to chats.
Open the
emoji tab of the sticker panel to browse your packs or add new ones. You can
tap a message to view and add the packs it's using
(press and hold on iOS).
Emoji are an
open platform – anyone can upload custom packs with their artwork.
All users can see any custom emoji and use them in their Saved Messages.