As a group admin, you can add a guest to an existing group conversation at any time. A guest is someone with a personal Wire account or a member of a different team.
In the conversation list:
1. Select the group conversation:
2. Select the group name at the top of the screen:
3. Select Guests:
4. Make sure the toggle is set to green/on and go back:
5. Select Add Participants:
6. Select the contacts you'd like to add:
7. Select ADD: