===================================================
Text viewer (You are viewing this file in it)
  - BASIC NAVIGATION
    - h, j, k, l - move in file
                   (left, down, up, right)
    - z, x - zoom in or out
  - TEXT VIEWER NAVIGATION
    - y, u, i, p - move whole screen
                   in direction
                   (left, down, up, right)
    - n - go to beginning of file
    - m - go to end of file
    - r - reset zoom to default
  - CONTROL
    - e - exit (Leave this window)

===================================================
Image viewer
  - BASIC NAVIGATION
    - Same as text viewer
  - CONTROL
    - e - exit
    - m - change mode to move cursor
          or whole image
          (for whole image, RGB LEDs will be green)

===================================================
File browser
  - BASIC NAVIGATION
    - Same as text viewer and image viewer
  - FILE BROWSER NAVIGATION
    - Same as TEXT VIEWER NAVIGATION
  - CONTROL
    - e - exit / go back window
    - v - confirm selection (open file, folder)
    - c - show context menu of file
===================================================

That's everything, you may quit using 'e' now.