Zotero Connector cannot save PDF

It's been a while since I got this problem. I've been trying to save PDFs using Zotero Connector, but when I click on the connector to save, it shows a red cross on the PDF icon.

https://s3.amazonaws.com/zotero.org/images/forums/u12318432/ul71q4xfp60x8vz6a7px.png

I have access to the article site using the institute's network. I have no problem viewing and downloading the PDFs. Manually importing the PDF file into zotero after downloading was also fine, also there are no problems with syncing with my WebDAV server. Article: https://www.sciencedirect.com/science/article/pii/S1526612521002498

https://s3.amazonaws.com/zotero.org/images/forums/u12318432/y2x5ir8cnam9redgihq8.png

The only problem is that I can't add PDFs using the zotero connector, it used to work but suddenly decided not to. Please help, it's very frustrating that I have to download every file manually.

BTW, here's the Debug ID for when I try saving an article using zotero connector: D1485934137

It's my first time summiting a debug request, please do let me know if any information is needed. Thank you in advance.
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