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Send messages, mentions and files

Direct messages, @mentions, attachments and notifications.

  • Guides
  • 1 min read
  • Updated 13 November 2026
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The Hubble mobile Direct Messages screen listing conversations with names, the latest message, the time and unread counts

Direct messages on mobile, with unread counts.

  1. Open Direct messages

    Choose Direct to see your one-to-one and group chats, with unread counts.

  2. Start a chat

    Pick a teammate, or search for one, and write your message.

  3. Mention someone

    Type @ and a name to mention a teammate. They get a notification.

  4. Attach a file

    Add a file in the conversation instead of sending it by email.

  • You can see when someone is typing.
  • Unread counts show which chats need you.
  • New messages arrive without a refresh.