Setup > Paperwork > Attachments - Click "New Upload" button.
Select type of upload from drop-down menu. Enter a title for the upload. Enter a description for the upload. Click "Browse" button. Select file from your computer and upload. Click "Save Changes".
Setup > Paperwork > Emails - Select an existing email for the attachment. Click to open or click "New Custom Email" to create a new email.
Locate "PDF Attachments" section. Highlight attachment to be associate with this email. Click "Save" button.