When I export a baked fluid sim to Alembic, it imports back into Blender just fine, but in Xcode, it's just a static mesh.
I've tried a few dozen different combos of bake and export options, and they all seem to work fine for Blender but not Xcode. The coder for this iOS app downloaded random Alembic files that use a Mesh Sequence Cach Modifier just like my file and they played back their animation inside Xcode with no issues.
We did notice that it seems like the animation node needs to have an empty parent node, but even after doing that we still just got a static mesh.
So we're at a loss. I've spent the past ~10 hours looking back and forth in Blender at the random Alembic file that works and my simulation that doesn't and I can't find a difference that would matter to Xcode. Only that the random Alembic tends to make Blender crash if I poke at it too much.
We're not dead set on using Alembic, we just want a solution that gets the animated fluid into the iOS app.