diff --git a/app/main/views/send.py b/app/main/views/send.py
index 84100af2d..08af846c1 100644
--- a/app/main/views/send.py
+++ b/app/main/views/send.py
@@ -547,6 +547,7 @@ def _check_messages(service_id, template_id, upload_id, preview_row, letters_as_
 
     if any(recipients) and not recipients.has_errors:
         session['file_uploads'][upload_id]['notification_count'] = len(recipients)
+        session['file_uploads'][upload_id]['template_id'] = str(template_id)
         session['file_uploads'][upload_id]['valid'] = True
     else:
         session['file_uploads'].pop(upload_id)
diff --git a/tests/app/main/views/test_send.py b/tests/app/main/views/test_send.py
index 0c6795a88..473bdf420 100644
--- a/tests/app/main/views/test_send.py
+++ b/tests/app/main/views/test_send.py
@@ -1443,9 +1443,9 @@ def test_upload_csvfile_with_valid_phone_shows_all_numbers(
         follow_redirects=True
     )
     with logged_in_client.session_transaction() as sess:
-        assert 'template_id' not in sess['file_uploads'][fake_uuid]
         assert 'original_file_name' not in sess['file_uploads'][fake_uuid]
         assert sess['file_uploads'][fake_uuid]['notification_count'] == 53
+        assert sess['file_uploads'][fake_uuid]['template_id'] == fake_uuid
         assert sess['file_uploads'][fake_uuid]['valid'] is True
 
     content = response.get_data(as_text=True)