Update share_btn.py

share_btn.py

@@ -55,7 +55,7 @@ share_js = """async () => {
         });
       }
     const gradioEl = document.querySelector("gradio-app").shadowRoot || document.querySelector('body > gradio-app');
-    const captionTxt = gradioEl.querySelector('#text-caption input').value;
+    const captionTxt = gradioEl.querySelector('#text-caption textarea').value;
     const inputImgEl = gradioEl.querySelector('#input-img img');
     const outputSound = gradioEl.querySelector('#sound-output video');
     const outputSound_src = gradioEl.querySelector('#sound-output video').src;