[Freesurfer] mri_label2vol --fill-ribbon argument

Dear Freesurfer's expert,

I want to create a 3d volume using an annot file and I'm using mri_label2vol command.

When running this command line:

mri_label2vol --annot sub1/label/lh.Yeo2011_7Networks_N1000.annot --identity --subject sub1 --hemi lh --o sub1/mri/lh.Yeo.nii.gz --temp sub1/mri/T1.mgz --proj frac 0 5 0.1

I get a 3d volume but the ribbon is not well filled so I wanted to use --fill-ribbon available with Freesurfer 6 but then I get a binary volume 3d of the ribbon without any information I had from my annot file.

Is there an error with this --fill-ribbon option ? How can I get this 3d volume of the ribbon from annot file ?

Thank you

Arnaud