saved pdf does not show up in folder
I'm saving an article to my folder by clicking on the Save to Zotero button, but it doesn't show up in my folder.
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Make sure you're not trying to save a file:// URL — i.e., a PDF that you've already downloaded to your computer. If the file is already on your computer, you would just drag it to Zotero.
While you should normally save from webpages, you can save PDFs from the web directly to Zotero. You may want to check your browser settings to make sure you're previewing PDFs in the browser (at http:/https: URLs) instead of automatically downloading them and viewing them in the browser (at file: URLs). Recent versions made that possible, but I wouldn't recommend it, since you'll litter your downloads folder with a PDF anytime you click on one, and you won't be able to add those PDFs to Zotero via the save button.
If you're clicking on the Save to Zotero button, presumably the PDF is open in your browser. So what browser, and what does the URL in the address bar start with when you're viewing the PDF? Does it start with 'http(s)' or does it start with 'file'?
You can drag the PDF from your file manager to Zotero.