Conversion of PDFs to M3: files
I have noticed that a considerable number of references in my library which originally had a PDF attached, now have a yellow folder icon with a name starting with M3 followed by a series of numbers. This has nothing inside it, the PDF is gone, and there is no html snapshot either. Can you tell me what may be causing this?
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see the link above ...
What this looks like is notes that have been created during import from RIS files, which have the DOI number in the M3 field.
I don't really see any way that Zotero would have produced this.