These features are only available to music label and distributor partners who use YouTube Studio Content Manager and the YouTube DDEX feed with version 3.6+ of the Electronic Release Notification (ERN) standard.
After successful delivery of your sound recordings, it can take up to 48 hours before the asset shows in the content management system and the Art Track appears on youtube.com.
If you delivered your sound recording over 48 hours ago but you still don't see the asset or the Art Track, check that you provided the correct ownership data for the recording.