The web site told me that I could upload nothing larger than 900 width, with a file no bigger than 50 mb. I had to compress it into oblivion to get it to meet those standards. I apologize, as I have never uploaded here, and am much more familiar with Vimeo and YouTube that accept nearly any file I can throw at it.
We allow up to 200 MB of upload, currently by Ron Lindeboom104776142
My apologies that we forgot to update the upload instructions to reflect that we had raised the maximum allowed is now 200MB.
I hope that helps in the future. (We will be raising it into gigabytes later on, but we are in the midst of testing and building our support and working out the bugs in our video support.)