How do I do this exactly?

I would like to retrieve metadata from a PDF and am trying to follow the instructions on the website: "Just drag them into the middle column, right click on them and select “Retrieve Metadata for PDF”.

I have dragged a PDF from my desktop into the middle column, but when I right click I get the following options: Delete item / Export item / Create bibliography / Generate report / Rename file.

What am I doing wrong? Thanks
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