How to add an animation/animated attribute for an animation asset?

As you can see, this is the animation from third person templete. And under the “Additive Layer Tracks”, there is a new option “Attributes” . I want to ask what is this for and how to add or remove some “attributes”. And the attributes “TCHour”, “TCMinute”, “TCSecond”, “TCFrame” means?

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Have you found a solution? I have exactly same question, but didn’t found any answer so far.

I’m looking for the same answers, hopefully someone will answer soon…