Be aware that as long there's no specific API for YouTube Music; we can only use the standard YouTube API here: https://developers.google.com/youtube
So the only thing we can do to add elements to YouTube Music is:
- Creating a YouTube playlist (which will then also be displayed on your YouTube Music interface)
- Like a YouTube video (which will then also be displayed in your "Liked Tracks" on your YouTube Music interface)
That means while moving favorites "Tracks" from a music platform to YouTube Music with Soundiiz, your songs will then be added to "Liked Tracks" on YouTube Music and not in your "Library Tracks" YouTube Music. Here you go => https://music.youtube.com/playlist?list=LM
Also be sure in your YouTube Music apps to have enabled the option => "Show your liked music from YouTube"
Finally, be aware that you can only "like" a maximum of 3000 tracks per day. That means if you are trying to move more than 3000 songs to YouTube Music, only 3000 will be added to your "Liked Tracks" list at a time.