Able to store any documents in to document data type

Does any one aware of this issue?

I am using my local server to upload a document in Appian using a!fileUploadField() component and storing it into document data type. When I look at interface rule input, I can see Appian is updating it with temp document, as expected. But after submitting form when trying retrieve a document in process model, I cannot Even my document PV is null seems like Appian is not updating a PV. I am attaching screenshot. Please let me know if this known bug in 17.3 local instance. I tested same in cloud Appian 17.3 Instances and local 17.1, it works file.  

a!formLayout(
  
  contents: {
    a!sectionLayout(
      label: "Doc Upload",
      contents: {
        a!fileUploadField(
          maxSelections :1,
          target:cons!SBX_TARGET,
           label: "Test Document",
      value: ri!document,
      saveInto: ri!document,
      required: true
          
          
        )
      }
    )
 
  },
  buttons: a!buttonLayout(
    primaryButtons: {
      a!buttonWidgetSubmit(
        label: "Submit",
        style: "PRIMARY",
        saveInto: {}
      )
    }
  )
  
)