The title society is in a remote mountainous jungle region, with lots of caves, underground lakes, and even an inactive volcano. It is very similar to the jungles of southeast Asia.
The people who inhabit this region are not savages, they live in a refined society that values knowledge above all, youth, life, hegemony, ect. When I say advanced I mean, they have a limited knowledge of physics, chemical compounds, healing, agriculture, and architecture.
I have looked into natural resources of the jungles here on earth, such as the Amazon, which is most understandably plants. I'm looking to get information so that I can diversify their trade.
What would a medieval society be capable of extracting from this jungle that would be both viable and valuable in a Euro styled medieval era.