foxrever Sorry for the confusion. Unfortunately, the Chinese user guide has not been updated yet, but the adjustment and fill layers are explained in the Limitations section of the Import PSD page of the user guide:
https://esotericsoftware.com/spine-import-psd#Limitations

As mentioned there, a workaround is to use the PhotoshopToSpine script. Since this script is for Photoshop only, it can handle some things better than the PSD import function available in the Spine Editor. (It can handle PSDs exported from various image editing applications, not just Photoshop, so it will not handle some Photoshop-specific layers or features).

There is an issue ticket here for improving the Spine Editor's PSD import feature, but since there is a workaround using the PhotoshopToSpine script, this feature is not a high priority:
EsotericSoftware/spine-editor861

foxrever

The error you’re seeing is a bug—we’ve just patched it, and the fix will be available in the next beta.

However, that still won’t allow you to import adjustment layers.

To work around that, you can convert each layer or group you want to export as an attachment into a smart object, and apply the adjustment layer inside it.
That said, if you have too many layers, this might be too tedious. In that case, you can use the method Misaki suggested above.