Foundation automatically generates the USDZ / REALITY files for the Mobile AR Viewer when you upload a GLB file.
Before you mint, we highly recommend copying and pasting the preview link from Foundation and testing it out on your mobile device. This preview will show you exactly how your file is going to behave on your mobile device once it is minted.
What could cause AR not to work on mobile?
Unsupported shaders and complex animations inside the glb/gltf can cause problems for the AR feature when converting to USDZ
AR does not work on Chrome for iOS mobile
For more information on GLTF and USDZ limitations visit: https://help.sketchfab.com/hc/en-us/articles/360046421631-glTF-and-USDZ#gltf-limitations