TWRP Internal Storage(0 MB) I am trying to root my Samsung A7(2017). I have installed twrp to my phone but when I open it to install SuperSU it writes Internal Storage(0 MB) therefore I can not access to SuperSU. I am searching this topic for hours and tried many ways but couldn't solve it. How can I fix this problem?
Sounds like your internal storage is encrypted. 

In order to fix this 


boot into the Android OS.
Set a screen lock PIN or password.
Make sure you save it as requiring password on startup.
Then bootup into TWRP and it should ask you for your password to decrypt. 
Put in the correct password


Your files should show up again.