Step One: Download the PDF to your computer.
Step Two: Open your Endnote Library, locate the reference, click on the "brown" paper clip.
A "blue" paper clip indicates that there already is an attachment.
Step Three: A pop-up window opens. Click on "Attach Files"
Step Four: Click on "Choose File" and locate the PDF on your computer.
Step Five: Paper clip will change to "blue" to indicate an attached file