Usually hosts of jams allow this to happen. Let's hope they reach out to you. What I've learned of jams is that you should always upload like atleast 3 hours before deadline, to overcome any possible issues that arise.
The last couple hours of any jam that lasts over 10 hours is meant to be spent playtesting your game through the itch website, seeing that the downloads and everything works and that your game page looks reasonable. I think you should adapt to this scheduling in future. Sorry to hear about your troubles now.