Draw on a vast database of existing videos to add more heft to your content, by importing external videos at selected points in your timeline.
Use the audio stream or replace it with your own video or audio narration.
The inserted videos become part of your project and can be edited within Adobe Presenter Video Express.
Based on the video playback length, the timeline is automatically extended.
Note:
If you insert a larger dimension video, Adobe Presenter scales down the video to the dimensions of the video that is already present in the project timeline.
If you insert a smaller dimension video, its original dimensions are retained.
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To delete or narrate on top of the inserted video, place the playhead at any point inside the external video region.
An option appears on the playhead to delete or narrate on top of the inserted video. For more information on narrating over the external video, see Add narration to external video.
on the project toolbar to open the 
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