@jahaura thanks for the file, you shared it correctly 👍
However the tail portion of the rig isn’t the same state as the initial screenshot. But I can say that technically it’s not a problem that the tail bone can be moved away from the rest of the rig. I can’t remember if that was possible or not in my original file, but the rig can still function fine with that ability.
As far as the current state of the .blend you shared, you’re in good position to complete the tail rigging portion of the video. Was there something else besides the detachment ability that threw you off?