Sometimes your message needs to stand out. With options for a headline and image, channel announcements help your message cut through noise.
Create an announcement
In the channel, select Format under the box where you type your message.
At the top of box that appears, select the arrow next to New conversation > Announcement.
Type a headline, change its background color, or add a background image for the headline area—lots of options!
Type the topic of your announcement in the Add a subhead area, then add the body of your message, and select Send .
Note: Announcement messages are available only in channels—not in group or 1:1 chats.