Hi, this thread is ancient, but I just ran into this same problem and was able solve it thanks to the lovely people on the internet who figured it out before me, so maybe this helps someone somewhere.
There could be a few things going on:
- Meshes cannot have more than 4 influences per vertex
- For every 75 bones, you need to specify a different shader group (in other words, your character can have more than 75 bones, provided you do this)
Also, just a tip that you can have Unreal Editor preview render to ES2 for you, so you don’t have to package to HTML5 to see if it worked. Make sure you always switch back to a different preview render mode, though, or set a different preview default, because I’ve had startup crashes with the editor when the editor loaded a level on startup that had some VFX ES2 didn’t like.
Hope this helps <3