Sometimes, it makes sense to convert a group direct message into a team, especially when they start becoming standing discussions. To convert a group message to a team:
  1. Open the group direct message conversation you wish to convert to a team.
  2. Tap the group name in the app navigation bar at the top of the screen.
  3. Tap the gear icon to expose the conversation settings menu.
  4. Tap Convert to Team from the conversation settings menu.
  5. Tap Continue to confirm.
Once a group message is converted to a team, you can give it a new name.