Can references-papers downloaded could me manifested in one interface?

When I read one paper,how can I know which papers in references had been downloaded and added into my library?And how can I quickly added them in Zotero?Especially without using other plugin? Because plugin did not work well from time to time.
  • You can't do this at all without an add-on: Zotero isn't aware of references cited in papers you store in it (I think others have answered the question pointing to plugins already)
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