When I go to share, it says the upload failed. Is this a bug or is it suppose to be like this since its the beta?

I think it's on purpose, Mixer didn't work for me either.

It should have been able to as part of the insders q&a asked if we were allowed to share screenshots stream etc, the answer was yes. I would assume that was a bug or a slight oversight from the NDA beta that was not allowed to stream and or screenshot.