The goal of this clinical trial is to evaluate whether non-invasive spinal cord neuromodulation with the SCONE™ device can improve upper limb function in people with multiple sclerosis. The study will investigate if combining SCONE™ therapy with rehabilitation exercises leads to improvements in arm and hand movement, and whether the therapy is safe and well tolerated in this patient population. Participants will receive non-invasive spinal cord stimulation with the SCONE™ device and perform rehabilitation exercises specifically focused on the upper limb.