The Fandom Post is reporting that the official Mobile Suit Gundam YouTube channel has added the Mobile Suit Zeta Gundam: A New Translation: Heirs to the Stars anime film to celebrate the channel closing in on two million subscribers. The film is available with the original Japanese audio and multiple subtitle tracks. However, it appears the film will only be available for streaming for a limited time.
The story of Mobile Suit Zeta Gundam: A New Translation: Heirs to the Stars is described as:
The Earth Federation stands victorious, but are they still on the right side?
Universal Century 0087. The Titans, a bellicose faction among the Earth Federation Forces, grows powerful and tyrannical, even using poison gas to suppress a civil unrest. Dissident soldiers from the same military stand against them, forming a resistance group called the A.E.U.G. Kamille Bidan, a civilian student, gets entangled in this conflict when he accidentally steals the Gundam Mk-II and joins the A.E.U.G., running away from his home space colony. Then he begins to fight along with Char Aznable, a former Zeon ace pilot who has infiltrated the Earth Sphere for reasons of his own.
Source: The Fandom Post