Clicking on an attached file opens it up for your use. Here you can change its Description, Type and add Comments. Note that changing these properties only changes it for the person/job/etc. it's attached to here, not other people/jobs that have the same attached file.
Click on E-mail this file to have VSys open your default e-mail application, or on E-mail this file directly from VSys to have VSys send it using the E-mail Robot.