Limit Purchase order draft pdf from going in approval mails

Summary:

Requirement is to limit users/approvers from seeing the draft of PO PDF. though, final pdf should go to supplier when PO is in open state.

Content (required):

The approval notification that is sent to the approvers contains the attachment of draft PO, is there any way to limit it (in email as well as bell notification), so that only buyer and supplier can have access to PO PDF.

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

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