Can't save pdf from website

Hi I am wondering why I couldn't save pdf from website directly to zotero anymore? but if I save some links or snapshot it works normally. My zotero is already the lastest version and I've tried so many times already, thanks a lot.
https://s3.amazonaws.com/zotero.org/images/forums/u10709904/nuc6u8zfzgkhdij3xuo2.png
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