I can't save the PDF from the web page

gaoziqi001

I have tried rebooting and checking for updates, it shows exactly as below, thanks for the help!
https://s3.amazonaws.com/zotero.org/images/forums/u11028441/7ke0kvc5ypyiswhlt537.png

poettli

Please provide an example URL for a failed attempt.

If it is from ScienceDirect, please refer to https://forums.zotero.org/discussion/comment/450008/#Comment_450008 and
https://forums.zotero.org/discussion/comment/451390/#Comment_451390