I figured out that with a rooted device you can trick the tablet into using the extsdcard. Works on both my tab 4 7 and tab 4 10.1. A simple script that has a single command as follows. mount -o bind /storage/emulated/0 /mnt/media_rw/extSdCard. When this is run at boot and I uninstall an app and reinstall, I gain free space on the internal card. It does however seem that the external doesn't show it being there. So I think it screws up the actual reported free space on the external. A better solution or improvement would be appreciated. enjoy.