You can’t store audio on relays, only events. But you can use blossom uploads.
nostr:nprofile1qqsph3c2q9yt8uckmgelu0yf7glruudvfluesqn7cuftjpwdynm2gygpz4mhxue69uhhyetvv9ujuerpd46hxtnfduhszrnhwden5te009skyafwd4jj7qgwwaehxw309ahx7uewd3hkctcafljxq has built one, works via blossom servers I believe?
Discussion
I going to update Plume soon to direct people who want more from the music to go to your music player. My hope is that people will come across content producers they're interested in while scrolling on Plume then go to appropriate apps to enjoy their content with full expected functionality.