TrialnError [1] filed a deletion request for nextcloud-app-radio [2]: URL and download are dead. And even if it worked, the last update was 2021. Which would make it likely incompatible with supported nextcloud versions.
[1] https://aur.archlinux.org/account/TrialnError/ [2] https://aur.archlinux.org/pkgbase/nextcloud-app-radio/
