does anyone know why this happens & how to fix this ?

For reference I’m trying to build and publish a Genshin model that I essentially ripped the head off of and gave a vroid head.

It is exportable but the issue is that it more or less loses the ability to move its eyes or mouth. It also generally just has no bones in the clothes or hair anymore and becomes static.

I was just wondering why it wants to remove the parts that allow it to keep those abilities? I’m new to this and just giving head first into things and trying to fix things on the way 💔