Hey,
Nice that you are joining the contest!
I dont think that you can edit anything after the deadline. If that would be possible, a lot of people would just upload drafts and reedit everything later. The time pressure is part of the competition, so I wish you good luck with that.
However I am curios what your story looks like. Wanna send a link?
Originally I wanted to join the contest too, but the drawings and the data were way to big... Short story is hard.
I hope you are doing better.
Best wishes
Amber