Object Won't Move with Armature

I don't know what I'm doing :-(

I'm trying to animate a propane molecule for PP, and apparently I need to do it in Pose mode with armatures in order for the 3D object to be a 'scene.'

So I separated the propane into three parts, added an armature and parented it to one of them, went into pose mode, and...nothing.

The object doesn't move with the armature. What am I doing wrong? (I know the armature isn't lined up with the bond, I just was trying to get it to work for proof of concept).

Thanks!

Scene: https://drive.google.com/file/d/1QgYidjXZTyF665mpAZF6dvUCV38m9VGL/view?usp=drive_link