Upload files to a book from show book view.

templates/book/show.html.twig

@@ -21,7 +21,7 @@
         </tr>
         <tr>
             <th>Description</th>
-            <td>{{ book.description | nl2br  }}</td>
+            <td>{{ book.description | nl2br }}</td>
         </tr>
         <tr>
             <th>Publisher</th>
@@ -61,6 +61,10 @@
             </tr>
         {% endfor %}
     </table>
+    {{ form_start(file_form) }}
+    {{ form_widget(file_form) }}
+    <button class="btn btn-primary">{{ button_label|default('Save') }}</button>
+    {{ form_end(file_form) }}
 
     <a href="{{ path('app_book_index') }}">back to list</a>