If you can’t see the main menu, click the three rows of dots at the top left corner of the window, which displays as Show All in earlier versions of Mac OS X.
Save a picture of screen as file will save the entire screen to your computer as an image file. Copy picture of screen to the clipboard will copy the entire screen to your clipboard for pasting. Save picture of selected area as a file allows you to save an image file of an area of your screen that you select. Copy picture of selected area to the clipboard will copy the area of your screen that you select to your clipboard for pasting.
Your keystroke combination must start with a modifier key. Modifier keys include ⇧ Shift, ⌥ Option, ⌘ Command, Control, ⇬ Caps Lock, or Fn. [1] X Research source Make sure that you enter a unique shortcut, meaning that the keyboard combination is not already designated to perform another task.