Use the Overlay panel to alternate the display of overlaid images or movie files.

From the Media ribbon, click the Overlay tool to display the panel.
Figure 1.

Figure 2.

Any number of files can be overlaid. Each loaded image or movie is listed on the Media Overlay panel. The master file is listed first, followed by the overlaid images. The overlay operation displays the master file for a user-specified number of seconds, followed by each active overlay image for a user-defined number of seconds. For example, if you have a master and four overlays, and overlays 2 and 3 are checked, when you click Apply, the master image is displayed for x seconds, followed by overlay 2 for x seconds, then overlay 3 for x seconds. This process is repeated for a user-specified number of iterations, or flips.

Index number
Selects a file to be the master file.
Active files on
Activates a file for you display as an overlaid file. Select the On check box next to the filename.
Duration (seconds)
Holds the frame for the duration specified.
Number of flips
Sets the number of times you want to review the overlay.
Apply to all windows
Applies the above settings to all windows.
Warning: Do not use the Media Overlay function while animating a video file.