It generally works BUT: (1) the field to edit the cover message has no formatting toolbar, and the markup rules are different from those in Slack, so realistically, rich formatting is not an option; (2) after a recent update, the resulting messages arrive to Slack attributed to Slackbot (rather than to me as it had been all the way since at least July 2020), so my teammates cannot readily see that it's from me, and I'm no longer able to edit the cover message (which is often necessary due to item 1 above), add more attachments, or delete the message if it has been sent in mistake.
Plus loading a list of Slack channels to select from is painfully slow.
It used to be a handy feature, but has become much less useful. :(
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