ProQuest RefWorks allows you to import a PDF right into your RefWorks folder. While this is a very handy function, you do need to check the citation. Imported PDFs may have incomplete information, such as missing authors, page numbers, etc.
There are two ways to import a PDF: from a file in your computer, or a recently downloaded file that shows up as an icon at the bottom of your screen.
i.e. your "Downloads" folder):