Put your character into whole clips, shot by shot: pick who to swap, check each shot, keep the best take.
Add whole clips (MP4, MOV, MKV, WebM or AVI, up to 2½ minutes) and a picture of who comes in.
Find the edits, keep or replace each shot, transcribe who says what and build the prompts.
Click who to swap, then check how they look in the scene.
Render each shot, compare takes, keep the best and put it together.