As well as I know, Unreal Engine doesn’t export dynamic lighting to HTML5. So, when I’m try to adding a dynamic object to a scene with a static lighting, object became completely black. Is there any way to use a dynamic object in a static lighting? Or i’m just doing something wrong?
The black effect that I am seeing in your image is usually a result of incorrect unwraps on your mesh. Can you look at the unwrap and see if your lightmap unwrap has overlapping islands or if the islands are not in the 0 to 1 space.
Also, rebuild lighting after adding the volume. That worked for me too. Added the volume on my map around the objects and then rebuilt lighting. Thanks for posting your solution!