Hmm video upload shouldn't take longer than a few hours at most (and may be longer for higher res formats). How long has yours been showing that it's still uploading? Here's more info: https://goo.gl/gH99rS
Thanks for trying. To help the right team better investigate, can you send a feedback report from the device having the issue: https://goo.gl/WdI0BK . You may not receive an individual response, but the details will help us identify and fix any issues.