Is it possible to add someone to a Channel if they are not part of the Team?
Nope, they get added to the Team as well. We'll probably be an option once/if we get Private channels.
@Vasil Michev thanks for you help. Is it possible to then have certain team members in a channel?I have a Team with multiple channels and not everyone needs to be part of each channel.
@jeffivey while its not permissions, people can hide any channel they don;t need to see, and then they can also avoid @channel notifications.