After opening the horse model from MalberS Horse Animset Pro, I select an animation clip from out of its animator, and drag it into the Import Clips dialog. For what appears to be every animation clip on the horse model, it gives an error saying "this clip of type "generic" uses a different rig than the animated GameObject and is thus not compatible."
Well, no, it doesn't. If the rigs were incompatible, it would not animate the model properly in Unity, but it does animate it just fine. And even if that were true, you would think that an animation editing tool would come with a feature to remap the bones of the animation's rig onto the object's rig in order to make it compatible, rather than just shutting the user down cold like that!
Unfortunately, as UMotion does not come with source code, I'm unable to do anything to track down the problem besides reporting an asset that reproduces it.
Customer support service by UserEcho