Get Contents of Folder Using UnityWebRequest

I'm using UnityWebRequest to grab files from the StreamingAssets folder in Android. At the start of my game I want to copy all the files from StreamingAssets to persistentDataPath so I can use normal file operations. To do this, I'd need to iterate through all the files within a folder I have in StreamingAssets. How do I do this using UnityWebRequests? I don't believe any normal file operations work because of how Android packs all the files from StreamingAssets into the apk.