You can access special export functions focused on highlighting the key images by using the buttons on the export toolbar:

Note: both export method use the same export dialog. They just load it with different default values.

A Diaporama is a video made exclusively from key images, each being displayed for an extended period of time.
Drawings and other additions are automatically painted on images of the video.

The resulting video plays at normal speed, except for Key images, at which video freezes for an extended period of time.

See also:

• Commenting and drawing on key images
• Saving videos