Yes, the limit is 10 MB per 3D object. If you encounter a "Type 2" error message when attempting to upload a 3D project, it is likely that your file is too large. Try reducing the size, and try the upload again. If you still encounter an error, please contact firstname.lastname@example.org.
You will want to keep your models as small as you can to reduce load times. You can use the optimization and compression features of Live 3D CX 2 to reduce unnecessary complexity, and otherwise prepare your model for the web.