This scope lets an app "View messages, activity, and files in private channels"
groups.history- Fetches history of messages and events from a private channel.
groups.replies- Retrieve a thread of messages posted to a private channel
channel_history_changed- Bulk updates were made to a channel's history
group_history_changed- Bulk updates were made to a private channel's history
message- A message was sent to a channel
message.groups- A message was posted to a private channel