i have look true the framework for the web platform and
wertexbuffer.web.cs is missint some code ?
do you have that code or is it not finish
all the othere code is fine , i think this is the only thing missing for load 3d models and render them
the code i have downloaded is this
GitHub - harry-cpp/MonoGame at 2f7ac1be6b46147f3ccfa196565bd2799ecefe13
thanks
Michael Hansen