Uploading downloaded pdf
I am using latest Zotero reference software on my windows 10 21h2 computer. I cannot upload any pdf to Zotero. Actually, I am not getting upload to Zotero. I am using it with a screen reader called nvda 2022.2.
Is this the same as what you were trying to do in your previous thread? It sounded like you had some misunderstandings there. You save to Zotero by clicking the Zotero Connector's Save to Zotero button in your browser toolbar while viewing webpages and PDFs online, not by selecting text in a PDF in your browser.
You should make sure you've read through Adding Items to Zotero to better understand how to save things to Zotero.
Generally, though, as noted on the linked page, you should use the Connector's Save to Zotero button from an article page rather than trying to save the PDF directly. Zotero will save high-quality metadata and automatically download the PDF if you have access to it.