Your two audio sources will now be perfectly aligned and, because your in-built camera audio is perfectly synchronised with your video, your external audio will now be synced with your footage as well.

Step 3: Link your footage and external audio

Now our microphone audio is synced with our footage we want to link the two files so any edits are done to them simultaneously.

First we have to unlink the footage from the camera audio. Select the video and the camera audio, right click on them and select Unlink front the menu.