How to enforce existence of at least one attachment on an item?

Summary:

In Product Development, We are looking for a way to enforce at least one attachment on item

Content (required):

Can we create a validation rule (or other way), that will warn users that an item does not have an attachment yet? It could be even better to check for specific attachment category and/or specific attachment file extension.

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

21c or higher

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