OverviewResource Preview
These settings control whether media files selected through the Select File dialog will automatically play in the preview window.
When a video file is selected, automatically start to play the video in the preview window.
When an audio file is selected, automatically start to play the audio file in the preview window.
These settings control whether objects will display a preview of their media files at design time.
Display each Flash object's first frame at design time.
Note: Some Flash files use scripting to include animation in the first frame. When this preview option is enabled, such Flash files will begin to play their animation as soon as the Flash object is added to the page or dialog.