You can create references by importing PDF files into your EndNote library.
What happens when you import PDF files into EndNote?
The references for these PDFs appear in your EndNote Library. EndNote will create a record for each PDF and attach a copy of the PDF to the record. This works best when your PDF has a DOI (Digital Object Identifier).
If the PDF is scanned or if it does NOT have a DOI ► In such cases the reference will only contain the PDF, and you will need to use the Find Reference Updates function in EndNote to create a new entry or to fill out the fields manually.
►Follow instruction on How to
If the imported PDF is scanned or does NOT have a DOI ► NO entry will be created in your EndNote library. You can use the Find Reference Updates function to create the entry.