Fail to catch the PDF on Sciencedirect
https://s3.amazonaws.com/zotero.org/images/forums/u12060087/jlp5vi6qnm7ab41nw4ot.png
I was sometimes able to grab PDFS from SD sites, and I often couldn't grab PDFS, so I had to save a snapshot in zotero. This problem bothered me for a long time, zotero was upgraded to version 7, and the zoteroconnect plugin was re-downloaded repeatedly.
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adamsmithYou should try from the article landing page, not from the PDF view. Zotero will try to get the PDF file and display the captcha to you as needed.