FolderMount Premium ROOT v2.9.7b Apk FolderMount is the solution to this issue. This app has the ability to link folders in your internal sdcard to folders in your external sdcard thereby populating the internal sdcard folders with content that really exists in the external card.
This helps us free space and have multiple games/apps with big data stored simultaneously without the need to uninstall. For Nexus devices with no external sdcard, this application should help link folders to a usb flash drive for example.
FolderMount Premium ROOT v2.9.7b Apk