unable to import pdf or any files to zotero

Hello,
I have just installed Zotero in my Ubuntu 14.04 and now i want to add some of the .pdf files into my library. when i do import the pdf file it shows me the message as "The selected file is not in a supported format."
How do i solve this issue?
Thank you.
  • Import is for supported bibliographic formats. You just want to drag the file to Zotero.
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