What happens in the music video for titanium?

In the music video for "Titanium" by David Guetta featuring Sia, David Guetta plays a wheelchair-bound producer who discovers Sia, a troubled young singer with a powerful voice. The video showcases scenes of Sia's emotional performance in an old, abandoned building as she sings about strength and resilience despite facing difficulties. As the song progresses, a young girl with prosthetics dances gracefully, showcasing her resilience in the face of her challenges. Visual effects blend with Sia's ethereal voice, conveying a message of triumph over adversity, representing the "titanium" spirit within all of us.