title: Fix Version vs. Release Version History in Jira
body: <p>In Atlassian JIRA, what is the difference between the fields "Fix Version" and "Release Version History", and when should you use what? I cannot seem to find any definitions and recommended usage of these fields online.</p>
  
  <p>This distinction is very much useful for me, especially for Epics, that span across fix versions. For example, if my Epic feature is being released in phases, e.g. 1.2.0, 1.2.1, 1.2.4 and 1.3.0, then should I:</p>
  
  <ol>
  <li>add each release version number to "fix version" after every release, or to "release version history", or both?</li>
  <li>If I add to only "release version history" while the Epic is in progress, then, when closing the Epic, should I update "fix version" only with that last release version number, or update "fix version" with ALL previous versions?</li>
  </ol>
  
  <p><em>(Side note: I realize that maybe I am not creating Epics correctly, that an Epic should ideally be rolled out in a single release (version)? If that is the case, please do correct me.)</em></p>