It appears that Reality Composer Pro 3 does not export a full USDZ file with textures, animations, etc. The best I can tell is that it exports only the mesh (as suggested by the menu name).
I have been using Reality Composer Pro 2 to create USDZ files to use as website environments.
Will we no longer be able to create website environments with RCP 3?
Will there be any way to download and use the old RCP 2 after upgrading to macOS 27 and Xcode 27?