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USDZ export
Unfortunately, there are multiple issues with UsdUtilsCreateNewUsdzPackage when it comes to layer referencing:
- the function can't seem to properly export the referenced .mtlx file
- even when inlining MaterialX as UsdShade, the referenced images are omitted
These two bug reports might be related:
- https://github.com/PixarAnimationStudios/USD/issues/1543#issuecomment-897271670
- https://groups.google.com/g/usd-interest/c/jos8g0t8w00/m/-9OG2nQZBQAJ