Prometheus from the Island of Viševica (1964)

A middle-aged manager of a big-scale company pays visit to his native island with his wife, in order to attend ceremony of unveiling a memorial plaque dedicated to local partisan heroes. During his visit, he's constantly overwhelmed by the memories from the past, his first love, the combat days and his enthusiasm to introduce electricity on the island, which was not appreciated by his fellow islanders.

Unfortunately the movie Prometheus from the Island of Viševica is not yet available on HBO Max.