Here's the quickest way to sync external audio to your video. This requires the camera to have recorded audio too.
In Adobe Premiere Pro, you import your video and audio file, select both of them, and right click. In the drop down menu select “Synchronize” and then hit “ok”. Then Adobe Premiere Pro will do it’s magic and sync it up.
Then I simply like to overwrite the camera audio since the external one is so much better and re-link those files so they don’t desync.
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