Post a message to multiple channels
Try it!
Cross-post an announcement or information to share it across multiple channels at once.
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In a channel, select New conversation > Format.
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Choose the message type you want: New conversation or Announcement.
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Select Post in multiple channels > Select channels.
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Choose which channels to post your message in.
You can share wherever you're a member.
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Select Update, and your selected channels appear in the post.
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Select Everyone can reply to let anyone respond to your post, or select You and moderators can reply to restrict responses to just you and the moderators.
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Type a message and select Send.
Your post appears in the selected channels.