Hello Kisa!
Any layer that uses add (linear dodge), multiply, or screen in Photoshop will cause its slot in the Spine JSON to have the corresponding blend mode. If it is not one of these 3, it will have a normal blending mode in Spine.
You could still manually change the blending mode of the slot in Spine by selecting the slot, then in the properties, choose a blending mode such as additive
from the drop-down menu to see your layer shine again. 🙂
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