Metadata

This might already be discussed and if so please re-direct me to that feed but I am having problems with retrieving metadata from PDF's. The best method has been to capture directly from the website but when I drag/drop into zotero and request retrieval of metadata, I only get partial retrieval (the journal, issue, year etc are not included) and I have to go back, find that reference on pubmed and get it included in zotero and then delete the original, incomplete, one. I saw that the search engine used is Google Scholar. Is that the problem or am I doing something wrong?

Secondly, is there a method to drag/drop a pdf into zotero without creating a duplicate in zotero? I know that I can create links to the pdf's at their preferential location. Now I have to drag/drop pdf's into zotero, retrieve metadata (incomplete) and then find the duplicated pdf in zotero. After this I have to work on getting proper metadata as described above. All this is making this a very cumbersome experience.

Thanks,
R

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