importing from Mendeley and storage
I was able to import my 2000+ articles from Mendeley, but the pdfs are still stored in the Mendeley directory. How do I get them to transfer to webdav storage?
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If you want to keep them as linked files but move the folder (e.g., to Dropbox for syncing), you can set a Linked Attachment Base Directory in the Advanced → Files and Folders pane of the Zotero preferences, rename the folder, and then update the base directory setting. Note that this is only about the folder where your PDFs are, not the Zotero data directory.
If you want to use Zotero syncing instead (either WebDAV or Zotero File Storage, the latter letting you access the files on zotero.org), ZotFile might be able to convert the linked files back to stored files, but I'm not sure. If you don't use ZotFile, new files will be added as stored files by default.
(Since this is a bit different from Mendeley, I'll also note that, if you use stored files, you'd generally always access your files through Zotero rather than through your filesystem, since Zotero uses its own internal folder structure, though we have plans to implement a more human-friendly organization for stored files for people who do prefer to use the filesystem. Some people also use an OS smart folder that shows all PDFs below the 'storage' directory.)
If you've synced all your files to Mendeley servers, you could probably disable that setting and use Help → Reset Mendeley Desktop, which will clear your local database and restore from the cloud. I believe that would then put the files back into Downloaded.