How do I attach a PDF document and have it display as an icon, not the full document?

Try using Applications/Utilities/Terminal - copy and paste the line below and hit return. Worked for me.

defaults write com.apple.mail DisableInlineAttachmentViewing -bool YES

Alternatively, you can right click or control click on the attachment in the body of the email and select 'view as icon'.

Wow! Simple when you know how. Thanks!

did that too but now my Mac Mail signature graphics attach as an icon too. Solution????