Where is documenation for DFP 1
The Getting Started Guide for Universal Email 3 (universal_email_gsg.pdf) has a link to documentation for Digital File Pro (for instructions for attaching a file), but this link resolves to the product page for Universal Email 4.
Logging in to my account and going to the Digital File Pro 1 download offers a link to Digital File Pro "Support Resources," but that also resolves to the product page for Universal Email 4.
Where is the documentation for Digital File Pro 1?