Why not check out the records of manned aircraft doing the same kind work in the China, Burma, India and southwest pacific areas in WWII? Also the experience of the Brits in Malaya and our experience in Vietnam with both fixed and rotary wing aircraft. I don't think the drone part is the important part. A drone is just an observation platform that has more endurance but no peripheral vision. The important part of your question is the rainy forested part and there is lots of experience with that. The Columbian and Brazilian experience would be good to look at also. In Columbia I believe we used things like the YO-3, in Vietnam too.
Just going from memory, they haven't been too successful. You can't see through the canopy. The NVA/VC used to move around thousands of men and vehicles, even tanks and we never saw them despite lots of airplanes and helos looking. Even in North Korea the PLA was able to move hundreds of thousands of men into position without our seeing much. There was no tropical forest there.
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