Send notification to External party from Deliverables whenever there is an attachment added

Summary:

Need a way to send notification to External party (vendor contact) from Deliverables whenever there is an attachment added on a fixed date.

The notification should be sent without criteria of due date or status change, and should automatically trigger an email when a new deliverable is created with an attachment.

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable): 24C

Code Snippet (add any code snippets that support your topic, if applicable):