When you click on the file manager button 
and then on 'import', you can import pdf files (but also MS Office, Open Office, IWB, TXT, RTF, Smart Notebook or P10 file types).
When you click on the file manager button and then on 'import', you can import pdf files (but also MS Office, Open Office, IWB, TXT, RTF, Smart Notebook or P10 file types).