diff --git a/src/components/ShareButton.tsx b/src/components/ShareButton.tsx
index d0d7a66..bc483e9 100644
--- a/src/components/ShareButton.tsx
+++ b/src/components/ShareButton.tsx
@@ -30,6 +30,7 @@ export function ShareButton({ variant = 'default', autoOpen, onHandleChange, onV
       // Prefer the XR broadcast mirror (opaque) if active — required during AR passthrough.
       let stream: MediaStream | null = null;
       const mirror = getBroadcastSource();
+      let frameSource: HTMLCanvasElement | null = mirror;
       if (mirror && typeof mirror.captureStream === 'function') {
         stream = mirror.captureStream(24);
       }
@@ -38,6 +39,7 @@ export function ShareButton({ variant = 'default', autoOpen, onHandleChange, onV
       if (!stream || stream.getVideoTracks().length === 0) {
         const canvas = document.querySelector('canvas') as HTMLCanvasElement | null;
         if (canvas && typeof canvas.captureStream === 'function') {
+          frameSource = canvas;
           stream = canvas.captureStream(30);
         }
       }
@@ -51,7 +53,7 @@ export function ShareButton({ variant = 'default', autoOpen, onHandleChange, onV
       }
 
       streamRef.current = stream;
-      const h = await startBroadcast(stream);
+      const h = await startBroadcast(stream, { frameSource });
       setHandle(h);
       onHandleChange?.(h);
       h.onViewerCountChange((n) => { setViewerCount(n); onViewerCountChange?.(n); });
@@ -96,6 +98,7 @@ export function ShareButton({ variant = 'default', autoOpen, onHandleChange, onV
   useEffect(() => {
     if (!handle) return;
     const swapTo = (canvas: HTMLCanvasElement | null) => {
+      handle.setFrameSource(canvas);
       if (!canvas || typeof canvas.captureStream !== 'function') return;
       const newStream = canvas.captureStream(24);
       const oldStream = streamRef.current;