My storage is being used but dont know where!!!

[Nicholas Baker]

Ok i downloaded the unofficial cm 12 and it crashed so had to reboot cm 11. Now my storage says i have 20gb used yet the phone has nothing on it but the basics. How do I get my storage back without a pc??? if need be contact me at 479-209-1383 cuz im never on here but i really need help, Thank you.

 

[benny3]

What firmware and version of recovery are you on?