@TeamYouTube Offline videos aren’t working without an internet connection in your iOS app. No matter how many times you click “go to library” to access downloads, it doesn’t work. Seems kinda pointless to have offline downloads if it requires an internet connection...
Please send a feedback report directly from YouTube: https://goo.gl/WdI0BK . While every individual report may not get a direct response, we do review everything and use the details to investigate and fix issues. Thanks.