Multiple flag fix (#1742)

* fix

* multiple file logic cleanup

* fix

---------

Co-authored-by: a <a>

src/main/resources/templates/misc/add-page-numbers.html

@@ -61,7 +61,7 @@
                 <span class="tool-header-text" th:text="#{addPageNumbers.header}"></span>
               </div>
               <form method="post" enctype="multipart/form-data" th:action="@{'/api/v1/misc/add-page-numbers'}">
-                <div th:replace="~{fragments/common :: fileSelector(name='fileInput', multiple=false, accept='application/pdf')}"></div>
+                <div th:replace="~{fragments/common :: fileSelector(name='fileInput', multipleInputsForSingleRequest=false, accept='application/pdf')}"></div>
                 <br>
                 <div class="mb-3">
                   <label for="customMargin" th:text="#{addPageNumbers.selectText.2}"></label>