For the best audio quality and video stabilization when shooting behind-the-scenes videos, it's important to attach an external microphone to your mirrorless camera.
Most mirrorless cameras have a 3.5mm mic jack where you can plug in a lavalier or shotgun microphone. If they don't come with one, you'll need to purchase an adapter separately.
You can also mount the mic on a rig for better sound placement and stability.
With the right mic setup, you'll be able to capture clear audio for your behind-the-scenes videos that won't distract from the viewing experience.