1) The file name is zinc.tml
2) it's in the ocean folder
3) I created the structure itself using the parseruin command and after it was created, I spawned it in with testruin. I also tried minecraft blocks to make sure it wasn't something about additions' blocks ruins didn't like and still no natural spawns.
The issue is not that I can't spawn it in with testruin, it's that it's not spawning naturally. All the other ruins that I've made work fine it's just ones like this that are supposed to be embedded in the sea floor that don't work.