To free up space if your device runs slow or crashes/resets, apps freeze when running them, or you can't save media, view this info.
From a Home screen, navigate: Apps > Settings > Memory .
From Average memory use, view the following:
Average used (%)
Tap Memory used by apps to view usage by individual application.
To modify the timeframe tap the dropdown menu (located in the upper-left) then select the desired timeframe (i.e., 3 hours, 6 hours, 12 hours, 1 day).
To free up additional storage space, unused items may be removed from the device such as: