‘From ‘Star Wars’ to ‘Jedi’: The Making of a Saga’:-
https://www.starwars.com/video/from-star-wars-to-jedi-the-making-of-a-saga - at StarWars•com. (A 1983 Documentary. 65 mins)
The blurb:-
“From Star Wars to Jedi: The Making of a Saga is the classic documentary chronicling the creation of the original Star Wars trilogy. Narrated by Mark Hamill, it features rare behind-the-scenes footage from the original trilogy.”