When I click File > Share > YouTube (username) a box pops up, but the "next" button is not highlighted and is not clickable. I've also tried to upload the files from the YouYube website but when I do I get this error and a 0% upload:
"We did not recognize the format of this file, but we will try to process it anyway. See this article on recommended formats for more information."
The file extension is
What can I do to successfully upload to YouTube?