Problem attaching Zotero link to file

I have a PDF file saved to my conputer, which I want to attach as a link to a citation in my library. However, when I right click on the citation, and click 'Add attachment', I am physically unable to click 'Attach link to file'.

I have tried to do this through Zotero log in on google chrome, where I clicked on the citation and clicked 'upload attachment', however it takes far too long and is unsuccesful in uploading the attachment.

How do I proceed from here??
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