The auto review connector reads your flow definition file and returns either a html review page, https://www.nomnoml.com diagram code or raw json code.
Get Flow action works with the output from the Connector 'Get Flow'. This is suitable for a personal automation as the connector only returns your flows
Get Flow Dataverse works with returning the flow from the workflows/process table. This is suitbale for admin use as it works with every solution aware flow.
Review Returns the html of a AutoReview report, simply use OneDrive or SharePoint create item to create the review file
Diagram returns https://www.nomnoml.com/ code that when used with the library creates a diagram of the flow
JSON returns a raw json object with all of the key data from the flow extracted. See the schema here: https://powerdevbox.com/assets/AutoReview-Schema.json