title: Can't open obb file although it is there
body: <p>I'm trying to mount an obb file but</p>
  
  <pre><code>std::fstream test("/storage/emulated/0/Android/obb/com.bixense.jngl_test/main.1.com.bixense.jngl_test.obb");
  assert(test);
  </code></pre>
  
  <p>says it doesn't exist (or I can't access it). When looking via adb shell the file is located here:</p>
  
  <pre><code>/storage/sdcard1/Android/obb/com.bixense.jngl_test/main.1.com.bixense.jngl_test.obb
  </code></pre>
  
  <p>Do I need to give my app some special permission?</p>