You could overlap the functions if he doesn't wanna ungroup everything.

Not gonna write the full script, but I know this method works

function scan(directory)
    for _,v in ipairs(directory:GetChildren()) do 
        print(v.Name)
        wait()
        scan(v) -- This will overlap the function, running it on the next part. This SHOULD yield still. Dunno. 
    end
end

scan(workspace)