Voice-of-Shadow Are you referring to this kind of appearance?:

Unfortunately, it is not possible to avoid the issue where overlapping areas of other attachments become opaque when each image attachment is made semi-transparent using only the Spine Editor. If the final product is a video, you will need to export the animation created in Spine and then apply the semi-transparent effect using video editing software. If such an effect is required at runtime, you will need to consider a workaround tailored to each runtime environment. Currently, in the spine-unity runtime, there is a relatively simple method to work around this issue using Unity's RenderTexture.
Similarly, if the finished product is a video, it must be processed using video editing software, or if the effect is needed at runtime, it must be processed using shaders at runtime.
某个项目无法换成100%不透明度的正常图层模式。因为阴影下面映照着纹理着地面的纹理。而正片叠底的部件是人物交替脚的阴影。
I am afraid I am not sure what the problem is in this section. It would be helpful if you could provide an example image to clarify.