I did a shop last night, was pooped, and woke up about 3:30 AM my time to make sure I did not go beyond the 12-hour reporting window.
After I did the spell check, I got caught in a loop and the website would not let me submit my report.
I went to sleep, woke up, and submitted my report; it was about two hours late.
I emailed HelpDesk to let them know what happened. No response yet. Hope I won't get a black mark.
The only proof I have is the timestamp on my PDF. I almost always save a PDF copy of my MFI report before submitting it.