Export to Swagger option in SOAPUI does not include definitions in resulting ap-docs file

Have SoapUI 5.6.0 installed including plugins available as part of download.   I am clicking and producing the ap_docs file in either YAML or JSON when clicking "Export to Swagger"  when right mouse clicking on "Project" in SoapUI.  

However the ap_docs file does not include the definitions showing the structure of the payload, why does it not have same YAML files if created in SWAGGERHUB?    How to I get SOAPUI to generate similar files as created in SwaggerHUB in YAML format?