diff --git a/studio-v2/app/api/vocabulary/[...path]/route.ts b/studio-v2/app/api/vocabulary/[...path]/route.ts
index e8ecec3..83c6a1f 100644
--- a/studio-v2/app/api/vocabulary/[...path]/route.ts
+++ b/studio-v2/app/api/vocabulary/[...path]/route.ts
@@ -20,10 +20,21 @@ async function proxyRequest(
       fetchOptions.body = await request.text()
     }
     const resp = await fetch(url, fetchOptions)
+    const contentType = resp.headers.get('Content-Type') || 'application/json'
+
+    // Binary responses (audio, images) must use arrayBuffer, not text
+    if (contentType.startsWith('audio') || contentType.startsWith('image')) {
+      const buffer = await resp.arrayBuffer()
+      return new NextResponse(buffer, {
+        status: resp.status,
+        headers: { 'Content-Type': contentType },
+      })
+    }
+
     const data = await resp.text()
     return new NextResponse(data, {
       status: resp.status,
-      headers: { 'Content-Type': resp.headers.get('Content-Type') || 'application/json' },
+      headers: { 'Content-Type': contentType },
     })
   } catch (e) {
     return NextResponse.json({ error: String(e) }, { status: 502 })