importing Endnote xml file to Endnote Web

Hi - I downloaded the 30 day trial version and successfully sync’d all my references. Attachments are now in endnoteweb. My second question is that I’m trying to export groups of reference (including the pdfs) for use as sources so I can conduct a systemic literature review in Nvivo? Have you any suggestions on how to proceed. [I can do this in the trial version but I am concerned that now that I’m moving to an endnoteweb environment how I might be able to do this into the future].