How can I clear the channel history?
The channel in question is a private channel created by me and is not (yet) archived.
Slack – How to clear the channel history in Slack
slack
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Best Answer
It's possible to batch delete messages through the Slack archives page, but this only lets you delete one page of messages at a time and does not delete any corresponding file uploads.
A better solution that deletes all messages from channels and/or groups, including file attachments, is slack-cleaner.