Local File Storage

Hi folks,
I'm a newbie using Zotero, so please forgive my ignorance. I have thousands of pdf files (books mainly) saved in a local folder in my computer that I want to add to Zotero, but apparently, when I add them to Zotero, it creates a copy of all the files in another Folder, together with the Metadata, etc. Is that the case ? and can I avoid that somehow, just to save up HD space?
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