Razer Basilisk V3 PRO is listed as supported by the Mac Preview software.
Most functionality works correctly for customizing mouse buttons.
However, remapping Mouse Button 5 to a Modifier key has no effect.
Specifically, I am trying to remap Mouse Button 5 → Shift, which shows as remapped in the Razer Synapse for Mac Preview but has no effect, i.e. keys typed while holding down the remapped Mouse Button 5 are not uppercased.
Also tried remapping Mouse Button 5 → Ctrl and that had no effect either.