Paste a link to a public Kahoot quiz (like https://create.kahoot.it/details/.../a1b2c3d4-e5f6-...-abcdef123456) or just the quiz ID at the end of the link. QuizFabric will download it and convert it.
Multiple-choice, type-answer, puzzle (ordering), and slider questions are kept — other question types are skipped because QuizFabric doesn't support them. Question images are downloaded too.
You can also just type a topic — QuizFabric searches Kahoot and steals the first public quiz it finds.