Why can't I upload videos to YouTube on my iPhone?

I have an iPhone 4S with IOS6 and it won't let me upload videos to YouTube for some reason, when I tap the YouTube button it tells me to type in my username and password but then it tells me that one was incorrect time and time again, I've gone onto the app and signed out and back in so I know that they are correct. I have no idea how to resolve this problem

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  • Why won't my iPhone let me upload videos to YouTube? I've tried every way, none seem to work. I've made a video using the app: Video Star (iPhone market), and now when I try to upload my video to YouTube, it always shows an error message saying something along the lines of 'not connected to YouTube account'. I can sign in to my YouTube account, but if this is the case, what could I do?
  • Why does my iPhone say invalid when I try to upload a video to YouTube? I have a YouTube account and when I took a video on my iPhone 5 I clicked upload to YouTube and it came up as a sign in screen. So I entered in my username and password and clicked sign in. It keeps saying invalid login? What's up?
  • Why can't i upload iphone videos to my computer? I try to upload videos to the computer or to youtube but it won't ever let me. The videos i'm trying to send are like 25-30 mins but even the one video that is 5 mins long won't even upload and its annoying and help would be nice
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