Aptly named Upload to YouTube, ready for Windows Phone 8.1 users
A couple of interesting things about the app. One, it won't upload to YouTube if it is running in the background. That might be okay with you for short clips, but if you're uploading a video of junior's ten rounds in the spelling bee, you might be making too much of a sacrifice to brag about your kid's spelling prowess on YouTube.
The other problem the app has is more cosmetic. The light grey UI makes it look like all of the buttons are greyed out, when the truth is they are functioning and are usable.
You can check out the Upload to YouTube app by clicking on the sourcelink below.
source: UploadtoYouTube via WMPoweruser