Stop Zotero from sending information about my articles over the internet

Hello,

when I click on "+" sign and then on "Link to file" or "Store copy of file", Zotero is adding the PDF in the library.

After a few seconds the PDF is moved under a new heading which contains all the articles metadata.

Since I don't think Zotero has a local db of all the articles, I believe it is somehow sending info over the internet to retrieve articles metadata.

How to stop is from doing that?
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