Mendelsohn's Incessant Visions (2011)

He drew sketches on tiny pieces of paper and sent them, from the WW1 trenches, to a young cellist, who was waiting for him in Berlin. She thought he was a genius and helped him become the busiest architect in Germany. When the Nazis came to power, Erich and Louise Mendelsohn escaped Germany forever. The buildings which Erich built, scattered as a trail of their journey, have changed the history of architecture. Incessant Visions is a cinematic meditation about the untold story of Erich Mendelsohn, whose life and career were as enigmatic and tragic as the path of the century

Unfortunately the movie Mendelsohn's Incessant Visions is not yet available on HBO Max.