"Itsu no Manika, Koko ni Iru: Documentary of Nogizaka46" from 2019 is a documentary that is much better produced, and it is easier to follow along with. Of course, if you are a fan of Nogizaka46 and already watched Kanashimi no Wasurekata, I think you should also watch Itsu no Manika, Koko ni Iru.
