Even I tried clicking on unsolicited evidence button and it was just refreshing the page. Please let me know if you find a way to make it work.
I guess otherwise we can only wait for one or two years until this I-751 get approved or until we file for N-400.
5/11 - Application submitted at USPS (expedited service, 1-2 day return shipping)
5/17 - Application shows "In Process" on tracking website with receive date of 5/16. Check cashed as well. Record locator starts with 35.