When you have opened the article click on the Save button in the PDF Viewer (which often looks like a computer disk). If you are using Adobe Reader or Adobe Acrobat to open the PDF outside of your web browser you can also use the Save As option under File.
If you are using a PDF Viewer within your web browser make certain to use the Save option within the PDF Viewer - do NOT use the web browser's File->Save Page As function.
Have more questions? See our LibGuide! http://guides.library.upenn.edu/resourcesharing