Native Slack integration - post not sending notification of a new post

Slack native integration does not alert to new post

Hello and thank you for your time.  I am using the native salesforce-slack integration.  I have written a flow which will post to slack when a record is created.  Everything works with the exception that the channel does not appear to reflect that  new post has been created, meaning,   I don't receive a notification of the new post.  is that a limitation of the slack integration or do I have to do something in my slack action to make notifications work?