Multiple flag fix (#1742)

* fix

* multiple file logic cleanup

* fix

---------

Co-authored-by: a <a>

src/main/resources/templates/convert/pdf-to-csv.html

@@ -18,7 +18,7 @@
               </div>
               <form id="PDFToCSVForm" th:action="@{'/api/v1/convert/pdf/csv'}" method="post" enctype="multipart/form-data">
                 <input  id="pageId" type="hidden" name="pageId">
-                <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>
                 <button type="submit" class="btn btn-primary" th:text="#{PDFToCSV.submit}"></button>
               </form>
               <p id="instruction-text" style="margin: 0; display: none" th:text="#{PDFToCSV.prompt}"></p>