First Contact: Lost Tribe of the Amazon (2016) online

Anthropologists encounter several groups of "Uncontacted" people in the jungles of South America, in a preserved region on the edges of Brazil and Peru. Patiently communicating as best they can, with the help of translators who speak a dialect not too different, they learn about these people's experiences with rubber barons and invasion years before. They begin to help them integrate into modern living.