Congratulations on your offer! You can absolutely use it to leverage a promotion with your current role. However, ask yourself which role would be more fulfilling and beneficial to your career. This is an ideal time to talk to your leadership about the career advancement you have been promised at your current role, while informing them that you have received another offer. Seeking an offer, purely for leverage, would not be recommended mainly because it wastes a lot of people's time and expectations. However, if it happens organically I think it is necessary to discuss with your current employer before accepting the offer.