Unity Version : 2020.3.45f1
Spine Version : 3.8 (spine-unity-3.8-2021-11-10.unitypackage)
The file exported from Spine was used in Unity UGUI, but the image was not drawn on the screen.
When I unchecked the 'Pma Vertex Colors option', the image was drawn, but the colors were strange.
So, I copied and imported the 'Spine-SkeletonGraphic-Additive shader' from the latest version of Spine and used it.
As a result, there were no problems with both the image and the color.
Could usage like this be problematic in the future?