Before you dive into manual fixes, try the simplest solution. Sometimes Zotero just needs a nudge to recognize the link again.
If your document has been completely stripped of its metadata and exists only as plain text (e.g., "(Smith, 2023)"), you can use the RTF Scan feature. Save your document as an .rtf file. In the Zotero standalone app, go to Tools > RTF Scan. Select your document as the input file. how to relink citations in zotero
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