In the Select Poster Frame window you can define which picture of a linked video is displayed in the thumbnail view of the Thumbnail button.  
The controller on the navigation strip shows the position of the picture in the video. You can specify the picture to be used by moving the controller.
The following buttons are available:
Plays the video back in the preview area of the window. 
Stops the preview. 
 
See also
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Customize Tab


Select Poster Frame Window