diff --git a/app/templates/views/uploads/preview.html b/app/templates/views/uploads/preview.html
index 05e70e5a8..fb11980c9 100644
--- a/app/templates/views/uploads/preview.html
+++ b/app/templates/views/uploads/preview.html
@@ -55,9 +55,9 @@
         <form method="post" enctype="multipart/form-data" action="{{url_for(
             'main.send_uploaded_letter',
             service_id=current_service.id,
+            file_id=file_id,
           )}}" class='page-footer'>
             {{ radios(form.postage, hide_legend=true, inline=True) }}
-            {{ form.file_id(value=file_id) }}
             {{ page_footer("Send 1 letter") }}
         </form>
       {% endif %}
diff --git a/tests/app/main/views/test_uploads.py b/tests/app/main/views/test_uploads.py
index 26845b415..163a6bee2 100644
--- a/tests/app/main/views/test_uploads.py
+++ b/tests/app/main/views/test_uploads.py
@@ -371,7 +371,7 @@ def test_post_upload_letter_redirects_for_valid_file(
     assert page.find('h1').text == 'tests/test_pdf_files/one_page_pdf.pdf'
     assert not page.find(id='validation-error-message')
 
-    assert page.find('input', {'type': 'hidden', 'name': 'file_id', 'value': fake_uuid})
+    assert not page.find('input', {'name': 'file_id'})
     assert normalize_spaces(page.select('main button[type=submit]')[0].text) == 'Send 1 letter'