How to upload files using the Feeds module?
You need to use Feeds XPath Parser module.

You may need this module if you would like to:   


  
  Import XML or HTML documents into nodes, users, taxonomy terms, or
  regular database tables.
  Scrape webpages like regular feed sources with scheduling, updating, and expiring.
  Extract content from HTML documents to create a semantic data bank or mashup.
  


Below links will help you to set up.


Feeds XPath Parser, a full-fledged XML parser that utilizes the XPath syntax for scraping feeds.
Importing from XML, from drupal.forhumanists.org.
Drupal 101: What I learnt from hours of troubleshooting Feeds.