Multiple flag fix (#1742)

* fix

* multiple file logic cleanup

* fix

---------

Co-authored-by: a <a>

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

@@ -21,7 +21,7 @@
             </div>
             <p th:text="#{processTimeWarning}"></p>
             <form method="post" enctype="multipart/form-data" th:action="@{'/api/v1/convert/file/pdf'}">
-              <div th:replace="~{fragments/common :: fileSelector(name='fileInput', multiple=false)}"></div>
+              <div th:replace="~{fragments/common :: fileSelector(name='fileInput', multipleInputsForSingleRequest=false)}"></div>
               <a class="btn btn-outline-primary" data-bs-toggle="collapse" href="#info" role="button"
                 aria-expanded="false" aria-controls="info" th:text="#{fileToPDF.supportedFileTypesInfo}"></a>
               <div class="collapse" id="info">