To resolve the issue of borders appearing around your animation in Unity, ensure that your export and import settings are consistent with the use of premultiplied alpha. When exporting from Spine, if you have enabled premultiplied alpha, make sure that your Unity import settings reflect this by disabling the "Alpha is Transparency" option in the texture import settings. Additionally, verify that your shader in Unity is set up to handle premultiplied alpha correctly. You can refer to the [spine-unity Runtime Documentation](https://esotericsoftware.com/spine-unity#Advanced
