Sometimes you need to add an article on your desktop to Zotero. This easily done by dragging and dropping the PDF file from your desktop to the center window of Zotero.
However, to use the article to create bibliographies or "write and cite," you will need to create a parent item that contains metadata (e.g. title, author, date).
There are two ways to add metadata to a PDF file that you have imported into Zotero. Both ways will create the entry and automatically attach your PDF file. Any notes attached to the PDF will not be lost.
Note: To retrieve the metadata from a PDF file it cannot be a file of scanned images, such as articles obtained through ILLiad or pages scanned from a print journal. You will have to follow the steps to manually enter the data with these files.