Hrm.
Publish your building's rules and art entry, not just the anims.
All of my own _a/_ad files are in a mix file, which I do because my RA2 directory gets flooded and then I start to go mad. I don't think this is the nature of your problem, though. But you might develop that habit anyway.
With trying to override previously existing art (yours doesn't represent this case either), I've found that if you don't override the same old path as the previous, sometimes it doesn't like you.
Without seeing your art file further, I couldn't say.
I have not, however, ever actually tried to make the _a/_ad files work straight out of the RA2 directory.
C
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