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An announcement is you speaking to your own group. Chattree writes nothing and decides nothing — it posts your words, once you have read them back and said yes. Use it for the things a group actually needs told: the venue moved, the meeting is off, fees are due Friday.

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Sending one

Message Chattree directly. You do not need the dashboard.
1

Find the group's number

Reply 4 for My Groups. Each group is listed with a number.
2

Start the announcement

Reply announce 1 — using that group’s number. Chattree asks what you want to say.Replying just announce lists your groups instead of failing.
3

Write it

Send the message exactly as you want it to appear. Your words are what get posted.
4

Read it back and confirm

Chattree shows you the message and waits. Reply yes to post it, or no to drop it.Anything that is not a clear yes or no gets the question again — a message to a group cannot be taken back, so Chattree will not guess.
Nothing is posted on the message that composed it. There is always a confirmation.

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The limits, and why they exist

Chattree’s number is shared with other groups. WhatsApp’s spam enforcement looks at a number’s behaviour, not at whether each message was permitted — so a number that posts constantly puts every group on it at risk, not just yours. Every announcement is checked against: If one of these stops your announcement, Chattree tells you which and nothing is sent. Hitting the weekly limit is not an error — it is the limit doing its job, and you can send it in a few days. Quiet hours and a busy number are delays: try again later and it will go out.

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What is kept

Chattree keeps what was posted to each group and when, including the drafts you decided against. That is what makes “three a week” something you can check rather than something you have to trust.

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Dates, which are not announcements

If the thing you want to say is a date is coming up, you do not need to announce it repeatedly. Tell Chattree once:
Chattree then mentions it in the weekly roundup and again as it gets closer — a month out, then a fortnight, a week, three days, and the day before. Each of those happens once. A wedding group has one date; a school group has a term’s worth.