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How do I import my EndNote library, complete with attached PDFs?
Obviously, manually adding every PDF from a large EndNote library would be rather labor intensive. There is a trick to automating it, though.
Zotero's RIS import does have the ability to import PDFs and Endnote does export links to your PDFs in the RIS files it generates. The problem is that Endnote does not give the full path to the file.
You should be able to import all the PDFs by using a single find and replace statement. In EndNote, you need to export your library using the RIS (Refman) style. It should be exported as a text document.
In it, you will want to find
internal-pdf://
And then replace it with
file://location/where/endnote/stores/your/pdfs
In Windows, this would look more like
file://C:/location/where/endnote/stores/your/pdfs
From there, you should be able to import the RIS file into Zotero as you normally would.