When was the world's largest waterfall by volume, Angel Falls, first documented by outsiders?

Angel Falls in Venezuela was brought to international attention in 1933 when pilot Jimmie Angel flew over the area in search of valuable ore deposits. The waterfall is often described as the world's highest uninterrupted waterfall, dropping about 979 meters in total. Although local Indigenous peoples knew it long before, the 1933 flight led to its global fame. It was later named after Angel, even though the site had long been part of Indigenous territory.