Yes, I have attached a link to the previous correspondence from the Freesurfer mailing archives here:

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For more context, I have functional data in an .nii.gz format that was pre-processed in FSL, but I need help converting it into functional left and right hemisphere surface maps in FreeSurfer for an input to a toolbox. Hope this makes sense.

From: freesurfer-bounces@nmr.mgh.harvard.edu <freesurfer-bounces@nmr.mgh.harvard.edu> on behalf of Douglas N. Greve <dgreve@mgh.harvard.edu>
Sent: Thursday, January 28, 2021 5:06 PM
To: Karan Desai <karansdesai@gmail.com>; freesurfer@nmr.mgh.harvard.edu <freesurfer@nmr.mgh.harvard.edu>
Subject: Re: [Freesurfer] Using mri_surf2surf to split files

Sorry, can you include the previous correspondence so that I have context. Also, please remember to post to the list

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My bad, I meant to say surfaces. Right now the files are downsampled on 
fsaverage4 space and I need to now split it into the respective left/right 
hemispheres. For context, these are .nii.gz files currently. Is there a way to 
easily do this in Freesurfer?

Best,

Karan Desai

Morey Lab - Duke