I went to Q&A screening of the movie at the Times Square AMC, moderated by Kelli O'Hara, who was a producer on the film. While she was in Hamilton, Goldsberry filmed a lot of behind-the-scenes and video diary type stuff that she half-meant to post on social media, but never did. There's also a good amount of more professionally shot rehearsal footage the film gets access to. Some of what's featured is Ham4Ham stuff that's been on YouTube for years and I think even footage from the pro-shot filmed version on Disney+.
If you're a Hamilton super-fan, it's worth seeing.
What the film is actually about though, is Goldsberry's difficult journey becoming a parent, and her struggle finding a work-life balance while in Hamilton. She was the only actress in the original production that had kids at the time, and there was like a two year period, she only saw her kids for one hour a day, on performance days.
Without getting too spoiler-y, the film reveals why she nearly didn't make the transfer from the Public to the Broadway production of the show.
