EDIT: So I think I was able to fix my prior issue (connector saving as a webpage instead of retrieving the PDF and not collecting metadata) by uninstalling and reinstalling the extension a 2nd time (it didn't fix it the..
It doesn't work. I try to insert a citation and it simply says "Zotero is updating your document please wait" -- endlessly. And yes the Windows Zotero app is indeed open...
More details about Zotero Connector
Zotero is an open-source free and simple-to-use tool that helps you organize cite and share your research. The Connector will save PDFs that are available to you to read later. It can also save snapshots of pages in case they change or disappear. Zotero supports thousands of sites so you can search for anything you need such as a preprint from arXiv.org or a journal article from JSTOR.
The Zotero Connector can also automatically redirect you through a proxy web-based to access resources that your institution subscribes. This ensures that you have always access to PDFs other protected content and links to those sites from anywhere on the internet.
The Connector can save most pages to your zotero.org profile but for the best Zotero experience you should install the Zotero desktop application. This allows you to manage your references efficiently and insert citations into Word LibreOffice and Google Docs.