Titled The Eyes of Orson Welles, the film debuted to rave reviews at Cannes Film Festival, and The Independent can exclusively reveal the first trailer.
Award-winning director Mark Cousins was granted access to the treasure-trove of work and made a documentary on the discoveries.
Orson Welles has long been the subject of many cinephiles’ fascination.
The Eyes of Orson Welles debuts in UK cinemas 17 August.