unknown error in PDF metadata retrieval,
28577538 ID: There is unknown error in PDF metadata retrieval. Kindly help me out
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Can you link to a PDF that's not working for you? Can you provide a Debug ID for an attempt that fails?
The way to save this item, along with its PDF, is simply to go to the JSTOR article page and save from there rather than trying to retrieve metadata for the PDF directly.
In theory we could add special handling for JSTOR PDFs, since there's a header page with metadata, but saving from the article page would still yield better results. (The header page also includes a link to the article page, but in a case like this, where the PDF is for a specific chapter and the article page shows the folder icon, that would also involve trying to match the chapter title in the PDF to a specific search result from the folder icon, and that would likely be error-prone.)
it's not from JSTOR. I am having this problem with all PDF files, even after dragging the file in Zotero
But again, you're not having this problem for all PDFs, because you said it worked for the PDF I linked to above.
Read through Adding Items to Zotero so you understand the basic recommend workflows for getting items into Zotero.