Update app.py

app.py

@@ -312,11 +312,21 @@ def embed_file(file, scale):
     path = pathlib.Path(file.name)
     data = base64.b64encode(path.read_bytes()).decode()
     if path.suffix.lower() == ".pdf":
-        # PDF：借浏览器内建 viewer，使用 #zoom=xxx 控制
-        return (
-            f'<iframe style="width:100%;height:800px;border:none" '
-            f'src="data:application/pdf;base64,{data}#zoom={int(scale*100)}"></iframe>'
-        )
+        b64 = base64.b64encode(pathlib.Path(file.name).read_bytes()).decode()
+    # 注意：把 JS/HTML 写在一起返回给 gr.HTML
+        return f"""
+            <script>
+            const pdf = atob("{b64}");
+            const bytes = Uint8Array.from(pdf, c => c.charCodeAt(0));
+            const blob = new Blob([bytes], {{type: "application/pdf"}});
+            const url = URL.createObjectURL(blob);
+            const iframe = document.getElementById("pdf_view") || document.createElement("iframe");
+            iframe.id = "pdf_view";
+            iframe.style = "width:100%;height:800px;border:none";
+            iframe.src = url + "#zoom={int(scale*100)}";
+            document.currentScript.parentElement.replaceChildren(iframe);
+            </script>
+        """
     else:
         # 图片：CSS transform 实现 zoom；支持拖拽滚轮缩放
         return (