Solved. Finally, I figure out that the 'root' of accessible storage is `/sdcard` or `/storage/emulated/0`. With permission (`android.permission.READ_EXTERNAL_STORAGE` is not required), I can access all the files under `/sdcard`.

Hi eyemcastdev, I'm now making a similar app for Oculus using Unity and faced the same problem. In my design, the user could select a local folder and then all media in the selected folder could be loaded to my app and then processed. With "ExternalS...