Exporting tagged versions
You can either export the latest version of a stream from the Streams tab in the solution’s page, or export any of the tagged versions of the stream by using the Export button 
The Export button in the Version history panel
When exporting a tagged version of a stream, the version tag and the optional description will be displayed in the Export stream dialog and included in the json file.
Exporting a stream with a tagged version
When exporting an autosaved stream, the version tag and description will not be included.
Exporting an Autosaved stream