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When inspecting a StandIn in Maya I only see the shapes and shaders. The screenshot in the online help https://docs.arnoldrenderer.com/display/A5AFMUG/Stand-ins clearly shows the transforms.
I've exported the StandIns with default settings and checked Full Path as well (no docs for this option found) but no luck.
If you use an aiStandin to load an abc file, you'll see the transforms.
But abc doesn't save materials. This would require an additional step in our pipeline using maybe MaterialX.
There's no transforms in an ASS file. The doc screenshot is for an alembic file.