add combine pdf toggle

app/models/account_config.rb

@@ -40,6 +40,7 @@ class AccountConfig < ApplicationRecord
   FLATTEN_RESULT_PDF_KEY = 'flatten_result_pdf'
   WITH_SIGNATURE_ID = 'with_signature_id'
   REQUIRE_SIGNING_REASON_KEY = 'require_signing_reason'
+  COMBINE_PDF_RESULT_KEY = 'combine_pdf_result_key'
 
   DEFAULT_VALUES = {
     SUBMITTER_INVITATION_EMAIL_KEY => {

app/models/submission.rb

@@ -86,4 +86,10 @@ class Submission < ApplicationRecord
     ActiveStorage::Blob.proxy_url(audit_trail.blob)
   end
   alias audit_log_url audit_trail_url
+
+  def combined_document_url
+    return if combined_document.blank?
+
+    ActiveStorage::Blob.proxy_url(combined_document.blob)
+  end
 end