You can set your EndNote preferences to automatically create a reference for any PDFs that you download to a particular folder. If EndNote is able to discover author & title information (because the PDF has an embedded DOI number), then the full reference will be created, otherwise a record showing the PDF name will be created, that you can then edit to add full details.
If you set this preference then when you start EndNote it will automatically create records for new PDFs in your download folder, attaching the PDFs to these records in your Library.
You can use EndNote to store your research PDFs and other file types. This will increase the size of your library, but makes accessing your PDFs more convenient.
You can attach up to 45 files (including PDFs) to a reference.
There are two main methods to attach a file to a reference:
To remove an attachment, double-click the reference in open the Edit panel. Scroll down to the File Attachments field. Click on the downward arrow on the file PDF icon and select Delete.
You can create a reference by importing a PDF into your EndNote library. This works best when your PDF has a DOI (Digital Object Identifier). A DOI is a unique number assigned to digital resources.