Fusion Using Adobe Assets scenario module - Create folder not working

We are trying to use the Adobe Assets module in Workfront Fusion in one of our scenarios. When we use the module with a working connection to our Assets Cloud environment, we get a Status 200 when creating the folder, but if we then look in Adobe Assets, the folder isn't there. 

We then thought that we might have to upload an Asset into the folder that was just created for it to appear. However when we use the Adobe Assets module in fusion to upload an Asset, we get the following error when providing the document reference from the Workfront Download Document module:

Body is not a valid JSON. Unexpected token < in JSON at position 0

I'm confused by this one as the Workfront Download Document module output provides binary data in the object, not JSON. Where do we get the JSON that the Adobe Asset upload asset module is expecting?