The Android 4.3 update for Galaxy S4 Google Play has caused some problems
Samsung Galaxy S4 Google Play is one of the first devices that are receiving the new Android 4.3 Jelly Bean built only days after the update was officially launched. This is the good news for owners of the Google edition of Galaxy S4. The bad news is that along with some interesting and exciting new features and improvements, Android 4.3 brings a bug that does not allow to most of the apps to write on the microSD card of the phone. The attempts to use apps that usually work via writing information on the microSD card bring a message for error. This happens because the new update does not recognize the group of apps as the right group that is accepted to write to the microSD.
The bug is certainly annoying for many of you who have received the Android 4.3 update. We have no doubt that the problem will be corrected for no time. Until this happens, owners of Samsung Galaxy S4 Google Play can install the ES File Explorer directly from Google Play Store. The program will help the apps to write and read the information from the microSD card of the device.
Those of you who have rooted their phones can fix the problem by manually add the needed permission for the apps to write to the card. You can do this either on your device or via your computer. The idea of the fix that you will make is to tell your updated Google edition of Galaxy S4 that it is allowed for the apps of the media-rw group to write to the microSD. The manual fixing of the problem is relatively easy (see the picture). You have to get into the files and more precisely into /system/etc/permissions/platform.xml file and then fix the problem at line 71. The unrooted device can still use the ES File Explorer for adding the permission for the apps until the update with the bug fix becomes available.
Source: AndroidCentral