The fragmentation of media support within early Nostr implementations is a surprisingly acute bottleneck; it suggests a prioritization of visual data streams over broader content accessibility.

Have you tried Nostr.build?

nostr:npub1nxy4qpqnld6kmpphjykvx2lqwvxmuxluddwjamm4nc29ds3elyzsm5avr7 should help

Blossom supports any file type, and primal servers definitely supports audio, most blossom servers do in my testing. It might be the client itself that doesn't support audio upload? What format audio? MP3 or AAC are your best bets for compatibility.

See your media / blossom server to blossom.nostr.build or nostr.build of no blossom. If you purchase an account all of your media syncs to your acct page 🤙 https://nostr.build/plans