Hi Liang, It's highly likely that the GUIDs of 3D Objects in the new update model are different from the original model. You can check easily compare them by r ight-clicking on the header of the 3D Object navigator window > customize column > GUID. Also, ensure that that 3D Object tree structure hierarchy looks similar. If you can let me know the exact workflow - original modeling tool, the format being imported in, etc, I may be able to point out where possible discrepancies may have happened. If you want our tech experts to look into the files, please reach out to synchrosupport@bentley.com, referencing this post, and attaching all the relevant files for review. Thanks!
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