Custom R15 Rig Auto Scaling?

So I’ve added a few body parts to an r15 rig and rigged it using a plugin. It created some Motor6Ds and OriginalSize values in the parts.

The rig works fine in the animation editor, and acts completely normal as a normal sized rig:

However, I’m utilizing HumanoidDescription to scale the character up, and the parts seem to resize properly, but their positions do not scale:

I’ve noticed in the normal r15 rig, there’s a bunch of “RigAttachments” with OriginalPosition values in them, and I suspect this is needed but I don’t really know how to go about this. All I have are the Motor6D’s

I’ve seen this post, but I could not understand the solution. I messaged the individual as well, and they were unable to help.
https://devforum.roblox.com/t/custom-character-scaling-bug-solved/278025/7

Any ideas?