I'm new here, so I hope I'm doing this right.

I finally started to use the vault feature about a month ago. I've made more than eight videos, but from the start I've been having problems. The first video I ever made wouldn't allow me to share it to facebook. So I skipped it and uploaded the other videos. I later made a couple more, but now I have another video that won't upload to facebook. I just recently made another video and it won't upload to facebook either. I've even deleted it and remade the video and it still won't upload. In all these instances it doesn't even bring up the option to render or share to facebook. Is there anyway to fix this? Am I doing something wrong? If so, I don't see how I've done nothing differently. I really do hope there's a way to fix this. I enjoy watching clips from my past games.