Selecting content by mouse
To select an item in the gallery listing, simply click it.
To add another item to selection, hold CTRL and then click it.
To select a range of items in the listing, click the first one, then press and hold SHIFT and then click the last one.
Selecting content by keys
Click in the gallery listing, and then press UP ARROW and DOWN ARROW keys.
To extend the selection up or down, press and hold SHIFT and then press UP ARROW and DOWN ARROW keys.