Best way to load an asset bundle that is already locally stored on iOS

I have a single ~60mb asset bundle that is delivered to my app through an in-app purchase. The bundle is downloaded to the Application.persistentDataPath folder. Currently I am using `www.LoadFromCacheOrDownload()` and pointing it to the "file://..." url to load the bundle when I need to use it, but my question is, **does this create a second copy in the cache that is needlessly taking up space on my users' devices?** It doesn't make sense to me to have to download my bundle and cache it when it is already on my disk. Thanks in advance for any assistance!