Symptoms
We are moving from SharePoint 2010 to SharePoint 2013. We are currently moving documents over to a SharePoint 2010 Compatibility Site. When we use the Upload Document SP 2010 Wizard we get a Data at root level is invalid error. It looks like we are passing the wrong value into the Use Content field of this wizard. My question is how do I change it to use XML as mentioned on the suggestion? I am using a k2 data field on the "Use Content" field of the upload wizard.
Diagnoses
The issue was related to the wrong item reference being passed into the Use Content field.
Resolution
I was able to correctly upload the document from SharePoint 2010 to 2013. We need to target the XML of the SP 2010 Document using the Retrieve Document method.