src as data:model/gltf-binary;base64,... ---> automatic usdz generation

I need to embed the glb model directly into the html.
For this reason I pass the model as `data:model/gltf-binary;base64,..` in src to modelviewer.
It is particularly important to me that the AR butten works on Apple and Google cell phones.
1. Does the automatic conversion to usdz work for apple devices, when using dataUri? Or better using "blob: ...?
2. Is it better to use datauri or blob?
3. Where does the conversion to usdz take place? (local or online)?
4. When I want to embed all content into a single html, is it better to also embed the usdz model?