I have an RCA Viking tablet running Android 5. It will no longer let me transfer apps to the SD card even though it used too. I contacted RCA support but someone named Mindy got back to me to tell me that you can't do that on Android. But I could before. And I still can on my Android phone. It mounts the SD card, but it will not allow transfer of apps to SD card anymore. It is driving me crazy as it could just a few weeks ago. Any advice?