1. Open the channel you'd like to add people to.
2. Click cluster of profile pictures in the top right.
3. Click  Add people.
4. To add a few people, search for the members you'd like to add by name, email address, or user group (if you're using a paid plan) and select them. To add a large group, paste the list of names or email addresses into the field.
5. When you're done, click Add.

1. Open the channel you’d like to add people to.
2. Tap the channel name at the top.
3. Tap  Add.
4. To add a few people, search for the members you'd like to add by name or email address and select them. To add a large group, paste the list of names or email addresses into the field.
5. When you’re done, tap Add.

Tip: On paid plans, you can invite a usergroup to a channel on mobile with the /invite @[usergroup] slash command.