Video won't play in edit mode?

I’m trying to edit an .mp4 that I have imported to WeVideo. When I play it from my Dashboard, it plays and sounds just fine. But when I move the video down to the video slots to edit it, I can’t hear the audio and when I click play, it doesn’t actually show it playing in the preview window, so I’m not sure where to make cuts. Any suggestions? I can’t find this issue in the Help section. Thanks!