Grey loading character color on custom dummy

Hello, i’m having this issue for my system where when i put in a humanoid in each part of the R15 body of my dummy only some part actually load the color, while the rest just seem to load forever, hence the cause of the grey bodyparts, is there a way that i can fix this?

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I believe the R15 rig only likes it when you put the part, LeftHand, inside the character model itself and not group it into other models.

Is the Parts model main part put as LeftHand?

Do you need to have all of the body parts in separate groups? If not, treat it as if it were a player and keep all the parts in one group so that they all load together.