PDF files on the web version of your library

edited yesterday at 7:27am
When I log in to my Zotero account on the web and look at my library (https://www.zotero.org/your-username/library ), I notice that some of the PDF attachments are not available on the web. Those PDF files that *are* available offer a button to read them online, whereas those that are *not* available are grayed out.

What's the difference and how to make the PDF files available online? Perhaps does the copyright status of the PDF files automatically restricts uploading?
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