DOI information
I don't appear to be getting any DOI information in Zotero. Am I missing a trick? A colleague who uses Mendeley gets this simply by dragging in a PDF.
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In general, to import items into Zotero, you want to use the Save to Zotero button in your browser from the publisher webpage. This is both easier than first downloading the PDF and will yield the best metadata.
See here for details https://www.zotero.org/support/getting_stuff_into_your_library