A vibrant cartoon with colours and smooth animation. Create a 60-second colorful 3D cartoon adventure for a USA YouTube Kids audience. Main character: a cute little bunny named Milo who discovers a tiny glowing door hidden inside an old tree. When Milo opens it, he enters a magical miniature world where everything is upside down. A frightened baby dragon is trapped inside a giant bubble and needs help. Milo tries funny ways to rescue him, fails twice, then notices a mysterious golden button. He presses it and the entire world suddenly turns right-side up, freeing the dragon. The dragon gives Milo a magical glowing star as a thank-you gift. End with Milo smiling and saying: "Sometimes the smallest heroes can make the biggest difference!" Make the video energetic, funny, emotional, and wholesome, with expressive characters, bright colors, cinematic camera movements, smooth animation, magical effects, and a surprising twist. Add upbeat child-friendly background music and engaging sound effects. No scary scenes, violence, or copyrighted characters. Start with an exciting visual hook in the first 2 seconds and end with a satisfying heartwarming moment. Title: Milo and the Secret Door! | A Magical Cartoon Adventure Hook text: "He opened a door that was NEVER supposed to be opened... "