We will use a simple Workflow to send attachments to any user who wants a copy of the document if someone modifies the document in the Library.
We will use SharePoint Designer for that, I have used SharePoint Designer 2010
- Open Library in SharePoint Designer
- Add a Reusable Workflow
- Workflow will be
Send email to Current Item:TeamLeadEmailAddress_Site_Column, display [%Current Item:Modified By%] as sender. Also include attachments or documents from Current Item as attachments in the email.
- Save and Publish the Workflow
- All Done