Uploading the engine configuration from an engine element

Example: the JSON description of an engine refers to the verb in the following way:

"link":
    [
        …
        {
            "href": "http://localhost:8082/7.2.1/elements/single_fw/1552/upload",
            "rel": "upload"
        },
        …
    ],

This verb can be found in each engine type. In this example, it is shown in a Single Engine. It presents a query parameter — a filter that can be uploaded on a specific policy (?filter=ThePolicyName).