Channel messages are visible to everyone who has access to the team, and you can’t see who has read them or not. If you want to send a message to a specific person or a group of people, you can use a chat instead of a channel. Chats are private and allow you to see read receipts. To see who’s read your message in a group chat, you can select More options > Read by on that message. Everyone with a read receipt confirmation appears in the list.
Otherwise, if you want to view analytics for a specific channel, you may refer to the article.
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