Import new freesurfer volume atlas in subject space for SEEG electrode localization

Hi, Francois I am also working on thalamic segmentation. I would like to ask the way to add this above mentioned free surfer based ThalamicNuclei.v12.T1.FSvoxelSpace .mgz as an atlas to the MRI. I tried the suggested way and successfully could make 3D picture with a surface of thalamus and electrodes. However when I try to project to the MRI as an atlas (by importing as a Volume), it seems that the "Label" was blank. Therefore I uploaded those according to the freesurufer LUT, to the Label, but seems the interpolation is not working. Could you please suggest me how to solve this?
Thank you very much for your help!