@mingjava Perhaps machine translation was translating your questions incorrectly, but if you want to use GetRepackedSkin or GetRepackedAttachments, then you have to disable texture compression on the source atlas textures to be compressed. This is documented here, in the important note box.
Theoretically you could later compress the repacked textures, but likely you don't want to do that as texture compression is usually a costly offline process.
mingjava 我的SkeletonGraphic 是通过皮肤组合起来的，可能来自不同的图集文件，这个时候是否必须打图集呢，让 SkeletonGraphic 使用 Multiple CanvasRenderers可行吗？
In general you can use multiple atlas pages from multiple atlases if it makes sense for your SkeletonGraphic object. You can repack the textures to a single atlas page, or keep two or more (increasing draw calls accordingly). If you are using multiple atlas textures, you have to enable Advanced - Multiple CanvasRenderers at the SkeletonGraphic component, yes.
