You can import PDFs into EndNote and, in many cases, EndNote will populate all reference fields (title, author, date, etc.) in your EndNote Library using the Digital Object Identifier (DOI).
If the DOI is not present, the PDF will be imported but the bibliographic data in the reference fields will be missing.
Note: If the PDF is imported without the accompanying DOI, you can edit the reference to add missing bibliographic data to the record.
Use the Find Full Text command in EndNote to locate the PDFs of references already in your EndNote library.
EndNote locates and downloads the full articles by accessing several sources:
This feature will find publicly available or open access articles.
You can add a PDF to an existing reference in your EndNote Library.