diff --git a/static/audio-store.js b/static/audio-store.js
index c2567ca..5fabd08 100644
--- a/static/audio-store.js
+++ b/static/audio-store.js
@@ -165,41 +165,23 @@ export async function sweepIncomplete() {
 }
 
 /**
- * Stream stored audio to an endpoint as a raw body.
+ * Send stored audio to an endpoint as a raw body.
  *
- * The body is sent as a stream (duplex: 'half') so a 200 MB file doesn't have to
- * be materialised as a second in-memory copy just to be uploaded.
+ * The OPFS File is passed to fetch as-is: the browser reads a Blob body lazily
+ * from its backing store, so a 200 MB master is never materialised in memory.
+ * (A ReadableStream body with duplex: 'half' was used before, but Chrome only
+ * allows streaming uploads over HTTP/2+, so any file past the old 8 MB cutoff
+ * failed with "Failed to fetch" on HTTP/1.1 — e.g. http://localhost.)
  */
 export async function send(fileId, url, {method = 'POST', onProgress} = {}) {
   const blob = await get(fileId);
   if (!blob) throw new Error('audio is no longer in browser storage — re-add the file');
 
-  // Small files go as a plain body: some proxies mishandle streaming duplex
-  // requests, and below a few MB there is nothing to gain.
-  if (blob.size < 8 * 1024 * 1024) {
-    const buf = await blob.arrayBuffer();
-    if (onProgress) onProgress(blob.size, blob.size);
-    return fetch(url, {
-      method,
-      headers: {'Content-Type': 'application/octet-stream'},
-      body: buf,
-    });
-  }
-
-  let sent = 0;
-  const body = blob.stream().pipeThrough(
-    new TransformStream({
-      transform(chunk, controller) {
-        sent += chunk.byteLength;
-        if (onProgress) onProgress(sent, blob.size);
-        controller.enqueue(chunk);
-      },
-    }),
-  );
-  return fetch(url, {
+  const res = await fetch(url, {
     method,
     headers: {'Content-Type': 'application/octet-stream'},
-    body,
-    duplex: 'half',
+    body: blob,
   });
+  if (onProgress) onProgress(blob.size, blob.size);
+  return res;
 }