When a workflow is created a first revision of the workflow is saved and can be viewed on the tab.
Revisions of a workflow can be published (and unpublished) from the 
menu and when published, a new revision is created. Once a workflow has been published, it can be accessed as a selectable workflow in TMS or Strings.
Revisions can also be renamed from the menu to make them easier to manage.
Every revision can be downloaded from the menu in .JSON format.
If a revision is indicating an execution, that execution can be viewed on the tab.