Today some apps store big files over the internal SD card (e.g. games, podcasts, offline RSS content, pictures, videos, offline navigation software). Typically users have a small internal sd card size (~16GB) while the external SD is a lot bigger (~32-64GB). Most of these apps users download from the Play Store save their application data in the internal sdcard by default and don't have an option
Size: 1.2 MB
Android Requires : 2.3+
More Info on Google Play:
https://play.google.com/store/apps/details?id=com.devasque.fmount