Import PDF file from

I am trying to import the following conference article:

I remember that the Zotero connector was able to download the PDF file previously. But it does not work anymore. It seems to locate the PDF file, showing "Full Text PDF", but it finally gives the red cross.
Debug ID: D389790063

Is it possible to get it to work again to import the PDF file?
I have tried to open the PDF file into the browser, but it downloads the file. So I cannot attach the URL to the PDF file by importing directly on the PDF file in the browser.
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