I think this might fit better into the Cesium ion section (so I just moved it here), but may it depend on whether the issue is indeed with the location editor or with the data.
When you say that you imported an external file and that you inspected the tileset JSON, which tool did you use to create that? (There may be errors or inconsistencies in that tileset JSON that may cause it to not be displayed properly in the preview window)
It is simply called “Cesium” format .
It is provided by my city’s government.
The ID is 3225385.
I tried to use the asset in Unreal Engine, but I can’t find a way to place the tile in the proper location. I tried adding the Unreal Engine Cesium component and adjusting various settings, but I still can’t move the tile correctly.
Even in the cesium ion asset preview, it still appears in the wrong location.
Looking at the asset it appears you have selected the 11-NE-16B-1/tileset.json file as the root tileset instead of tileset.json. Typically the one a the root of the zip file is the one you want to use.
Please try uploading this data again, but select tileset.json instead of 11-NE-16B-1/tileset.json.