I have a 17 second video and audio clip (background noise) and I'd like to loop this to complement a voiceover which is 2 minutes 18 seconds long, approximately. I've had a look at the help videos and posts but none of these work for me, such as, mark the clip in and out and create a loop - this just loops that section of the voiceover with the video without continuing. Or, if I mark the start and end of the voiceover, the video/audio clip disappears after it's run its 17 seconds. Is there a way to do this other than creating enough new mp4 files to import into the project to cover the length of the voiceover?
Adding to what Richard said. To duplicate the clips, you may select the audio-video clip in the timeline, copy it by using Ctrl+C (on Windows) or Cmd+C (on macOS) & then paste it multiple times by using Ctrl+V (on Windows) or Cmd+V (on macOS). Hope it helps. Let us know if you have any questions.