Today when I attempted to open my papers that I saved a while ago, I find that none of them can be opened until I relink the PDF files. The program tells me that "Unable to open this file. If you have a copy of this file on your computer you can import it via File - Add Files". The PDF files are not lost in the Mendeley folder, but they somehow don't show up when I try to open them in Mendeley Desktop.
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