Drag and Drop PDFs

Can anyone tell me how to successfully drag and drop a PDF onto Endnote in order to import it?

I often download papers to read them, and then decide I want to import them to Endnote.  Right now I have to go to import, and then figure out which of the crazily labeled downloaded PDFs I am reading.

I used to drag and drop the file into Papers, but I can’t figure out how to do this consitently with Endnote.  Does anyone have a solution to this?