Can you add an option on zotero connector so that when we click it, the PDF is loaded instead of directly saving it to zotero? A lot times I open a paper in PDF, read for a few mins and then close it. Even there is no way to annotate it without adding it to zotero, it is fine. On the PDF viewer there can be an option to add it to zotero to annotate.
There's already an option in the General pane of the Zotero settings to not download files when saving items.
If you're on a webpage and you want to view a PDF, you can just view it in your browser.