Three ways to get the WAV into your video
CapCut (mobile or desktop): open your project, tap Audio → Sounds → Import, pick the WAV from your files, then drag it under the first clip. Split it with the blade where your visuals change. TikTok's own editor: after recording or uploading clips, tap Add sound → the folder icon on newer versions, or upload the WAV as a “sound” through the desktop uploader. Premiere or DaVinci: import the file like any other audio track. In every case, mute the original clip audio or duck it to about −18 dB under the voice.