Hi. I recently published my app on Flathub and have been steadily updating it to make it better.
With it you can download Music from Youtube and tag it to create a beautiful collection of local Music. Check it out: https://flathub.org/apps/net.fhannenheim.musicfetch
I can say that the app works on mobile but I still need to optimize it. The UI is a bit weird when the scaled small and the keyboard doesn’t auto-activate because libcosmic is missing support for the wayland protocol used to do that.