Also worth noting is that it's only available to your primary YouTube account. For me that somehow became a different one created when they foisted Google Circle on everyone. So my actual YT account, that I use every day and matches my email address, can't access my saved YT music. I have to change YouTube profiles to listen to it, which I do on occasion.
That's weird, maybe you live in a country where that service isn't available anymore? When they switched from GPM to YTM all my uploaded music was migrated, and I still can upload music, like the person you're replying to. But I think you have to do it from desktop, it's not in the mobile app.
Yes, but in my experience it is pretty trash. Unlike Google Play Music which matched the music to known tracks and shuffled it in with recommended playlists and other features on YouTube Music the uploaded songs are basically completely isolated. At that point why use a streaming service?
I paid for GPM for quite a while. I then started working at Google and beta tested YouTube Music from very early on and gave lots of feedback about how it sucked. When they shut down GPM I cancelled my YouTube Premium membership and installed an ad blocker. Not just YTM but so many things about YouTube were getting worse and worse and I couldn't find it in myself to keep paying for a service that kept removing features.
I see that Apple does now, but no indicator of Spotify that I can see. Are you talking about how you can run the desktop app to stream the files on your computer? Because that's not a digital locker.