What is this button used for?

Since Android 4.4+ the External SD card has been unavailable to apps without express permissions and a framework exclusive to Android. The Web IDE is a true native web/database server and has no way of accessing this framework.

However, a folder is created on your External SD card that is private for the app itself. The Web IDE can read/write to this folder. It is a long and cryptic path, so this button takes you to that folder and locks it as top level.

Remember, this is the only path on the EXTERNAL SD the Web IDE, SL4A, Python 4 Android, and JRuby 4 Android can read/write to.

If you uninstall I<code> Go this folder is removed by Android.