Previewing Files with Quick Look
With Quick Look, you can quickly view the contents of an item in a file list field or message list field without opening it.
To preview a file:
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Click Icon for options for displaying files and choose Quick Look filename or press the Space bar.
The content you see depends on the type of file. If it’s an image, you see a smaller version of it. If it’s a text document, you can read the text and scroll to see more. If you selected multiple items, you can use the arrow keys or the buttons at the bottom of the Quick Look window to move from one item to another.