Thanks for posting this. I just managed to catch it. Hopefully it will become available again at some point. I've seen some Winogrand exhibitions but never things like the home movie footage of him photographing (or his own films). It's really good how, although it has the typical talking heads of a documentary, the vast majority of the screen time is using a blizzard of his photographs to illustrate their commentary.
Opinion on Winogrand's late unseen work has really moved over the years as the film makes clear, and there are many photos in the latter part of the film from that work. His later life was marked by a series of setbacks in part due to his unworldly nature (the film doesn't say this, but for example it was my understanding that a major reason he left New York was that he lost his rent-controlled apartment because he couldn't or navigate its conversion to a co-op; which has some parallels to his neglect of his own health).
As someone says towards the end, then there is also the question of what meaning people will extract from the photographs in 100 years. (Presuming our society sticks around that long.) Already I think the photos of the 1960s and 1970s carry some additional meanings to what they did at the time of his first retrospective in the late 80s.