Sync files but deleted

Hi all. My Zotero web library is now by mistake. I want to sync my local files previously backed up. But when I add the backed-up file to my local Zotero and click sync. All of the pdfs disappear! What's the problem? Thanks!
  • Sorry. Now I find the problem. I should click the Sync button on the upper right instead of right-clicking My Library to sync.
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