Emailed invoice from Reprint does not include attachment

In Psoft Financials Billing (Ptools 8.60.15), when emailing an invoice using the reprint process, the attachment from "Supporting Documentation" is not included in the email to the customer if a user other than the one who added the attachments does the reprint.

Navigation: Billing > Generate Invoices > Non-Consolidated > Reprint Invoices

Scenario:

1. User 1 creates an invoice and adds an attachment (Billing > Maintain Bills > Supporting Documentation), then finalizes and emails the invoice from Billing > Generate Invoices > Non-Consolidated > Finalize and Print Invoice. The email to the customer includes BOTH the invoice PDF and the attachment PDF.
2. User 2 emails the invoice from the 'Reprint Invoices' menu. The email to the customer contains ONLY the invoice PDF, not the attachment PDF that was included in the original email.