wangzhipeng Am I correct that you are trying to import skeleton data files exported from Spine 4.2 into Unity to create skeleton data assets?
If so, the version of the Spine editor and the version of the spine-unity runtime would need to match for the import to work properly, so please let us know what versions you are using for each.
Also, in case of a general import problem, a message will be displayed in the console window, so please check the console to see if you see anything.
