With the Android 4.4 update (KitKat), Google brought a not-so-pleasant thing by revoking the write capability to external SD card by app on an Android device.
You can abilitate again only with root privileges. Use http://www.kingroot.net to get root on your mobile phone.
After gaining root, modify /system/etc/permissions/platform.xml file this way:
- look for this entry: name="android.permission.WRITE_EXTERNAL_STORAGE"
- Now add the following string of code just after <group gid=”sdcard_rw”/>.:
- save and reboot
See this picutre for better undestanding: