I added some PDFs to my Mendeley Desktop from my documents folder. I sent these PDFs to the trash from my documents folder and emptied the trash. I can still access all of these PDFs in Mendeley. Then I added some more PDFs to my Mendeley Desktop from my documents folder. I also sent these PDFs to the trash from my documents folder and emptied the trash, but now I can't open these PDFs in Mendeley. Why can I open some after I've deleted them from my documents but not others?
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