It's kind of annoying and disappointing that this continues to be an issue when more people are looking for alternative tech. I've been uploading for over a year with a few hiccups here and there, but for the last few days staring April 8th - April 12th I've had issues uploading long form videos.
My standard videos that are anywhere from 5min to 19min haven't been an issue. It's been my Let's Play videos that are 26min in length that aren't uploading. I am using HandBreak. The most common error is "Please Upload A Video".