diff --git a/core/archipelago/src/bootstrap.rs b/core/archipelago/src/bootstrap.rs
index 2288711f..92bc8cb9 100644
--- a/core/archipelago/src/bootstrap.rs
+++ b/core/archipelago/src/bootstrap.rs
@@ -48,6 +48,14 @@ const NGINX_BITCOIN_STATUS_BLOCK: &str = "\n    location /bitcoin-status {\n
 /// sync with the canonical block in image-recipe/configs/nginx-archipelago.conf.
 const NGINX_LND_PROXY_BLOCK: &str = "\n    # LND REST proxy — backend handles auth + CORS\n    location /proxy/lnd/ {\n        proxy_pass http://127.0.0.1:5678;\n        proxy_http_version 1.1;\n        proxy_set_header Host $host;\n        proxy_set_header Cookie $http_cookie;\n        proxy_set_header X-Real-IP $remote_addr;\n        proxy_connect_timeout 10s;\n        proxy_read_timeout 10s;\n        proxy_send_timeout 5s;\n        error_page 502 503 = @backend_unavailable;\n        error_page 504 = @backend_timeout;\n    }\n";
 
+/// Inserted into every server block lacking the peer-content streaming proxy.
+/// Without it, the browser's `<video>`/`<audio>` Range requests to
+/// `/api/peer-content/*` fall through to the SPA index.html (HTML, no Range)
+/// and peer media won't play (B3). Forwards Cookie (session auth) + Range and
+/// disables buffering so streaming works. Kept in sync with the canonical
+/// block in image-recipe/configs/nginx-archipelago.conf.
+const NGINX_PEER_CONTENT_BLOCK: &str = "\n    # Peer content streaming proxy (B3) — Range-streams a peer's media file\n    location /api/peer-content/ {\n        proxy_pass http://127.0.0.1:5678;\n        proxy_http_version 1.1;\n        proxy_set_header Host $host;\n        proxy_set_header Cookie $http_cookie;\n        proxy_set_header Range $http_range;\n        proxy_buffering off;\n        proxy_connect_timeout 10s;\n        proxy_read_timeout 120s;\n        error_page 502 503 = @backend_unavailable;\n        error_page 504 = @backend_timeout;\n    }\n";
+
 /// Entry point called from main startup. Never returns an error to the caller —
 /// failing to bootstrap host artifacts must not prevent the backend from serving.
 pub async fn ensure_doctor_installed() {
@@ -536,8 +544,14 @@ async fn patch_nginx_conf(path: &str) -> Result<bool> {
     let missing_app_catalog = !content.contains("location /api/app-catalog");
     let missing_bitcoin_status = !content.contains("location /bitcoin-status");
     let missing_lnd_proxy = !content.contains("location /proxy/lnd/");
+    let missing_peer_content = !content.contains("location /api/peer-content");
     let has_lnd_dup_cors = content.contains(NGINX_LND_DUP_CORS);
-    if !missing_app_catalog && !missing_bitcoin_status && !missing_lnd_proxy && !has_lnd_dup_cors {
+    if !missing_app_catalog
+        && !missing_bitcoin_status
+        && !missing_lnd_proxy
+        && !missing_peer_content
+        && !has_lnd_dup_cors
+    {
         return Ok(false);
     }
 
@@ -567,6 +581,22 @@ async fn patch_nginx_conf(path: &str) -> Result<bool> {
         }
     }
 
+    if missing_peer_content {
+        // Same anchoring as the LND proxy: prepend the block to every server
+        // block so /api/peer-content/* reaches the backend instead of the SPA.
+        let anchor = if patched.contains("    location /lnd-connect-info {") {
+            "    location /lnd-connect-info {"
+        } else {
+            "    location /electrs-status {"
+        };
+        if patched.contains(anchor) {
+            let replacement = format!("{}{}", NGINX_PEER_CONTENT_BLOCK, anchor);
+            patched = patched.replace(anchor, &replacement);
+        } else {
+            warn!("nginx conf missing anchor — skipping /api/peer-content patch");
+        }
+    }
+
     if missing_bitcoin_status {
         let anchor = "    location /electrs-status {";
         if !patched.contains(anchor) {
diff --git a/tests/production-quality/TRACKER.md b/tests/production-quality/TRACKER.md
index 23408cb3..f6d05a3b 100644
--- a/tests/production-quality/TRACKER.md
+++ b/tests/production-quality/TRACKER.md
@@ -111,6 +111,9 @@ Live (2026-06-15) federation sync last_transport on .116/.198: ~4 peers fips, ~6
 ### B21 — Show Tor/FIPS transport pill on cloud browse — FIXED (build+type-check green; deploy+UI-confirm on .116/.198)
 Tag whether the peer connection is Tor or FIPS and surface it as a small pill on the cloud browse screens / connection loader. Data source: federation node last_transport (now recorded by B14) exposed via federation.list-nodes; frontend renders a pill (FIPS=fast/green, Tor=slower) on PeerFiles.vue / Cloud peer view + the connection loader. Frontend-only-ish. FINDINGS: PeerFiles.vue:46 loader HARDCODES 'Connecting via Tor...' even when FIPS used (bug). Frontend types already have last_transport ('fips'|'tor'|'mesh'|'lan') federation/types.ts:31; NodeList.vue:167 already renders a transport indicator. PLAN: have content.browse-peer RETURN the transport used (B14 already computes it) → frontend shows a pill (FIPS green / Tor amber) on PeerFiles header + fix the loader text to reflect actual/attempted transport. Small backend (add transport to browse response) + frontend pill.
 
+### B22 — Peer cloud download/audio errors (.228→.198) — TODO (pairs with B3)
+Observed 2026-06-15 browsing .228's cloud from .198: (a) downloading a peer cloud file → "Operation failed. Check server logs for details." (b) playing a peer AUDIO file → "Could not play audio. File Browser may not be running." (misleading — it's a peer file, not File Browser; that's the OLD base64/blob path B3 replaces). ACTION: (a) check content.download-peer backend error on .198 logs while downloading (likely the same Range/transport/timeout path as B3, or a peer-side 4xx); (b) verify B3 streaming fixes peer audio once deployed, and fix the misleading audioPlayer error string. Get server logs: ssh .198, journalctl -u archipelago | grep -i 'content\|peer\|download'.
+
 ### B8 — netbird app doesn't work — TODO  (LOW / much later)
 
 (RETRACTED: CryptPad placeholder-icon — user says cryptpad is fine.)