Please visit Mass File Upload Configuration Guide to view the configuration guide. This configuration guide will walk you through the required steps to configure and start with the Mass File Upload.
PS: View Mass File Upload, Salesforce file upload app, on Salesforce AppExchange: https://appexchange.salesforce.com/appxListingDetail?listingId=82cf236b-1ee8-4ea7-aebf-fd0c89fb93bd