I am stuck with a weird issue.
I made a model of fish with an armature in Blender 2.8 and exported it using standard fbx export options.
The model works, the basic swimming animations work too, but when I try to add a trail controller to the tail to give some smooth movments, the bones suddenly rotate at 90° from their original position, creating a pikachu-like tail.
I made sure to apply the transformations of rotation and location to both armature and mesh in Blender, and the axis orientation of the model and armature seem to be similar between UE4 and Blender.
Any idea what could cause this issue ? I tried adding this trail controller to some free models of the marketplace and it worked perfectly…