When I run 1.2 on iOSI get the normal Corner, Load, Save options in the structure block. In windows 10 the only option is Export 3D. There is no ability to load after the export. I assume it did not make it into the release. while the export works specifically for integration with remix and paint 3d. The actual functionality of the structure block is broken compared to the other platform(s) in the 1.2 release.