optimize for large files

config/routes.rb

@@ -67,6 +67,7 @@ Rails.application.routes.draw do
     resource :folder, only: %i[edit update], controller: 'templates_folders'
     resources :submissions_export, only: %i[index new]
   end
+  resources :preview_document_page, only: %i[show], path: '/preview/:attachment_uuid'
 
   resources :start_form, only: %i[show update], path: 'd', param: 'slug' do
     get :completed