I'm using Filmora 9 and editing video footage from my new Olympus OM-D E-M1 mark iii camera. It's the first time I've tried recording speech using the camera, and I'm struggling with sound synchronisation issues. I've had to clip the footage to remove unwanted material at the start, and now for some reason the sound doesn't sync with the video whilst I'm viewing in edit mode. What's more, in some cases short segments of the sound repeat like an echo that's not there in the original footage. Can anyone advise me on what I might be doing wrong?