PDFs still not saving from chrome

When I find a PDF to save in Chrome they are regularly not saving to Zotero even when PDF icon showing - I click on it and nothing happens. Just as commonly the PDF icon often isn't showing either. It's so easy when it does work and so frustrating when it doesn't. Right clicking on the PDF or the Zotero icon doesn't help either - I can select 'Save to Zotero' but nothing happens.
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