Audio out of sync - please help
I'm using an iPhone 6 to record videos and Hitfilm 4 Express as my editor for my YouTube channel. I've imported and used four or five videos with no issues. The editing was perfect and the final products were beautiful. Last night and today I've encountered the audio becoming out of sync in the trimmer after a couple of minutes. It appears to get worse and worse as the video plays. It plays just fine with a video player outside of HitFilm.
I am quite new to video editing and am unsure what I need to do to remedy this issue. And unfortunately, I have a deadline to meet today for my business with regards to these videos.
Thank you so much for your assistance!