Imported pdf will automatically be copied to the storage folder under Zotero Install Directory?

Hi everybody!
When I import a pdf research article into Zotero, it will generate a new record. When I double click it, it will jump to a new pdf in the storage folder under Zotero Install Directory. So the software will automatically copy the imported pdf?
Wouldn't that be a waste of computer's storage space?
Thank you !
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