PDF has no parent - unable to give it tags

Hi, new Zotero user.

I have dragged over thousands of references from my desktop, and for the majority of them Zotero then creates a "parent" for it (based on meta data I believe?). I can then click on the parent and add tags to it (I would prefer to use tags rather than collections when searching for items based on subject).

For some pdfs, a parent is never created. And I am unable to click on the pdf to create a tag. Is there a way to remedy this? Thanks.
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