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 icon > Settings > Storage & USB.
If Settings is unavailable, tap the Dropdown menu (located in the upper-left) then select Alphabetical. If still unavailable, refer to Manage App Icons.
From the INTERNAL STORAGE and REMOVABLE STORAGE sections, view the available space.