Hey I had a similar problem with portico a couple of months back. The UCL help desk take AGES to reply, unfortunately, and I was only able to get a quick response because the admissions tutor for my course happened to stumble across my post on student room and help me out. How important is it that you upload these documents? If they aren’t compulsory then don’t stress out TOO much. Have you called the help desk? If you go on the portico website you can get their number, I believe.