I've just googled the "Mágoa cave paintings" also known as caves of the thousand Buddhas. And yes of course there's evidence suggesting ancient populations in Asia had connections to Africa, including people with dark skin. Migration event, saw Blacks from Africa, some with straight hair and "Mongol features" take an "Inland route" through southern Asia and on up to China.

Also the video below confirms what you said about the initial advanced civilizations were all us. This video is actually based on the book of Cheikh Anta Diop.