You need to wait for a firmware update to your phone and then accept Extras+info app update. The extras+info app update installs the Storage Check app to the Lumia device. It will be visible in the Settings menu.
- What Bluetooth profiles are used on my Lumia phone?
- How can I check the IMEI number of my Lumia phone?
- The cable connection between my Lumia phone and computer does not work
- What can I do if the latest Lumia extras are missing on my phone?
- Why are the photos taken by Lumia Selfie different than with a normal camera on my phone?