To import video files across slides:        

  1. Click the Import Video button to launch the Import Video Clips window.

  2. Navigate to the desired video file, select it.
  3. Choose where you want to insert the video clip:               
    • In the beginning of the current slide
    • At cursor position
    • After existing clips

  4. –°lick Open to import the file
    click Cancel to exit without importing the file.

The selected clip will be added to the timeline.