I too have same issue so I raised query through communication portal nbe I got reply that once submitted in edit window it cannot be submitted again.However if they are in need of  any images again then they will mail through your registered email Id before admit card release..

Hi Aspirant,

Hope you are doing great as per the question asked by you, as there is no need to worry as the correction window will certainly start once the form filling gets over that is 2nd of May and after that you can certainly upload the correct image. As such no correction window dates have been notified by the N.T.A so you are advised to visit N.E.E.T official website that is: neet.nta.nic.in .

Hope you found this answer useful. Stay motivated stay positive.

All the best!