This scope lets an app "Access content in your direct messages"
im.history- Fetches history of messages and events from direct message channel.
im.replies- Retrieve a thread of messages posted to a direct message conversation
conversations.history- Fetches a conversation's history of messages and events.
conversations.replies- Retrieve a thread of messages posted to a conversation
im_history_changed- Bulk updates were made to a DM's history
message- A message was sent to a channel
message.im- A message was posted in a direct message channel