The following tutorial will show you how you can manage and upload your content (songs, videos, images, etc) to Apple’s iTunes artist connect.
About Apple Music Connect for artists:
Apple Music is for you, the artist, to connect directly with your fans. Share your ideas, audio, videos, and photos; any way you choose to express yourself is possible with Connect.
To participate in Apple Music Connect, your music needs to be available on the Apple Music service. This service also requires an Apple Music subscription. It’s easy to sign up and start sharing. Visit the following link to learn more about how you can get your music on iTunes if it is not already https://www.apple.com/itunes/working-itunes/connect/
You can request access once your music is on Apple Music and the iTunes store, or if you already have music on Apple Music and the iTunes Store by visiting the following link https://itunesconnect.apple.com/WebObjects/iTunesConnect.woa?ct=artist
Here is what your page will look like during the approval process until it is approved.
When you are approved you will receive an email like the one below:
Next step is to log into your account here https://artist.itunes.apple.com
Move the song, video, image to your iPhone or iPad and use the Apple Music app to upload it to your artist as seen in the pictures below. As for now I believe you can not upload content from iTunes on a desktop it has to be an iOS device. Follow the steps below.