Avocado model is public domain, via KhronosGroup/glTF-Sample-Models
For more info about the available attributes, see https://github.com/GoogleWebComponents/model-viewer#attributes
Example embed code:
Requires a workaround to upload glb file to your assets: add ".txt" to the end of the filename.
Then you can then get the link by clicking on the asset's ⚙️ and then the flie's ↗️ like this: