I am trying to add audio to my beautiful video, but they won't go together. In the timeline I have video up to a point and then the audio begins, and I can't figure out how to get them together. I am using the trial version of VP, Windows 10 and the Chrome browser, watching my extensions carefully and now have .mp3 and .mp4 on the audio and video respectively. Can anyone hazard a guess at what I'm doing wrong?