Testing XML input to Router Management Portal or via XML document viewer

Trying to test a router that takes an XML input and performs a transform on it.

First attempt I tried to test the transform using the XML Document Viewer via the Ensemble -> Interoperate -> XML Document Viewer menu. The transform itself is working however I can not get the output to save to a file. I've made sure permissions are set correctly on the file. It simply doesn't output anything and I'm at a loss as to why.

As another method I also tried testing via Ensemble -> Test -> Business Hosts. Putting the file path/name as the source does not send any data. Again, I've made sure read permissions are set for the file.

I've been able to test using other methods, so I'm not concerned with actually being able to validate my transform so much as I'm now at a loss as to why the two above methods do not seem to work.

Has anyone else experienced similar issues, particularly with the XML Document Viewer method?

Thanks.