Did you ensure the application type of your edge is "VOD Edge"? The simplest test would be create a VOD Edge app called "vod-edge", create a MediaCache source (let's call it "file"), with a prefix of "path1/" and a base path of say "/usr/local/WowzaStreamingEngine/test/" (if on Linux, this is a sub folder under the base Wowza install).
Then to refer to content stored in the base path you would construct the URL something like (HDS example)
You do not need the file source to be an NSF export, though the main reason for using Media Cache is to have the storage on a network and to cache it locally to reduce network traffic for subsequent calls. Using a local filesystem as the source just means you're caching to the same local machine, though I appreciate you may just be doing this to test configuration.