Automation: Attachment Added or Changed?

I am trying to understand how this works.
I am working on an automation such as following:
When Progress is "Update Needed" and attachment is added or changed, an approval request will be sent out.
When I tick both When Attachment is "Added" and "Changed", I received 2 notifications.
Is it because an attachment is added and when attachment is added, there is changes in "attachment", so I receive 2 notifications?
When will I need to use "when an attachment is changed"?
Trying to understand better.
Thanks.
Vivien Chong
Modern Work Management Consultant @ 57Network Consultancy Sdn Bhd
Connect with us: 57network.com
Answers
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When will I need to use "when an attachment is changed"? - My best guess is for revision control on this.
As for both notifications it might be that its triggering 1 for the new or changed row and another for the new or changed attachment. I'm not 100% on it though. Figured maybe this might help get the ball rolling.
Regards - JC