Try it!
Create and format a post or announcement to start a conversation in a channel.
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Select the New conversation button.
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Type a message.
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Select Format
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To create an announcement, select a post type > Announcement
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Type a headline and an optional subhead, and then add a color scheme or your own background image.
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Format your post including the following options:
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Font size
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Bold
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Bulleted list or Numbered list
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Insert link
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Select Send
: To make changes to a post or announcement, select More options 
