saving files

hello there! When I want to save the pdfs that I already had on my desktop to Zotero, I only find the button Save to Zotero (webpage with/without snapshot) option. and saving does not work. But if I get into google scholar etc, and find the relevant work there, there appears the saving button... I do not see why t does not work the first time. It is the same pdf at the end of the day. Will you be so kind to help?
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