@jeffreyrb03-gmail
Please see our comments below:
We can make the preview draggable, and add the option to edit an existing model.
we can add social features
The “add user avatar” block is fixed now
Add user avatar is different from adding community model in that it assumes the model is an avatar with human skeleton, so it supports all the animations.
The categories are fixed as they are used as filters on top of the model library window. They are not that important, since most users simply search for models by name
Sketchfab charges money for most of their models, so there is no API to allow our users to freely use their 3D models.