>>303498995
The unity editor log will list the assets from biggest to smallest in your assetbundle when you upload the avatar. It's a little annoying to get to, instructions in https://docs.unity3d.com/Manual/LogFiles.html
>To view the Editor log, open a Console Window (menu: Window > General > Console
) and select Open Editor Log from the Console window menu.

Then scroll through it and you should see details for "vrcw.assetbundle" iirc.