diff --git a/index.html.final b/index.html.final
index 2b7cb05..0317ea4 100644
--- a/index.html.final
+++ b/index.html.final
@@ -2594,17 +2594,40 @@ async function doExtract() {
       return;
     }
     
-    var blob = await r.blob();
-    var url = URL.createObjectURL(blob);
-    var a = document.createElement('a');
-    a.href = url;
-    a.download = 'gather_extract_s' + Math.round(start) + '_d' + Math.round(duration) + '.zip';
-    document.body.appendChild(a);
-    a.click();
-    document.body.removeChild(a);
-    URL.revokeObjectURL(url);
+    var taskData = await r.json();
+    if (!taskData.task_id) {
+      setInfo('Extract error: no task_id returned');
+      return;
+    }
+    var taskId = taskData.task_id;
+    setInfo('📥 Processing extract task...');
     
-    setInfo('📥 Downloaded: ' + (blob.size / 1e6).toFixed(1) + ' MB');
+    // Poll until done
+    while (true) {
+      await new Promise(function(resolve) { setTimeout(resolve, 2000); });
+      var sr = await fetch(API + '/tasks/' + taskId);
+      var sd = await sr.json();
+      if (sd.status === 'done') {
+        setInfo('📥 Downloading ZIP...');
+        var dr = await fetch(API + '/tasks/' + taskId + '/download');
+        var blob = await dr.blob();
+        var url = URL.createObjectURL(blob);
+        var a = document.createElement('a');
+        a.href = url;
+        a.download = 'gather_extract_s' + Math.round(start) + '_d' + Math.round(duration) + '.zip';
+        document.body.appendChild(a);
+        a.click();
+        document.body.removeChild(a);
+        URL.revokeObjectURL(url);
+        setInfo('📥 Downloaded: ' + (blob.size / 1e6).toFixed(1) + ' MB');
+        break;
+      } else if (sd.status === 'error') {
+        setInfo('Extract error: ' + (sd.error || 'unknown'));
+        break;
+      } else {
+        setInfo('📥 Processing... ' + (sd.progress || ''));
+      }
+    }
   } catch(e) {
     setInfo('Extract error: ' + e.message);
   }