Thank you for the answer, but I missanderstood, what do you mean.
I try to reimport UCC asset ("23 Oct 2018","version":"2.0.4"), create first person character without body and create assault rifle with NolanFirstPersonArms and FirstPersonDemo controller.
So as I think, all animations and other files of UCC asset are default.
And I dont understand, what do you mean in my case about humanoid rig?
In my case I have only NolanFirstPersonArms rig, which is generic by default.
But animations of default weapons, i.e. AssaultRifleReloadFirstPerson, are also generic.
Please describe more detailed.
Here is the new project with just ucc imported ("23 Oct 2018","version":"2.0.4") and first-person-character with assault rifle created.
link:
Please test "reload" in it with and without debug mode and help.