diff --git a/apps/table.html b/apps/table.html
index ae8075125..ce1aae5c7 100644
--- a/apps/table.html
+++ b/apps/table.html
@@ -212,7 +212,7 @@ <h5 class="modal-title" id="title-of-dialog">Upload New Slide</h5>
                                 <h3>Steps for uploading.</h3>
                                 <ul>
                                     <li>Select the file you wish to upload. The <b>Token</b> field should be automatically populated .</li>
-                                    <li>Enter the desired filename, including its extension, for the destination file.</li> 
+                                    <li> Provide the destination filename with extension. For example "sample.svs"</li> 
                                     <li>Click on the <b><i class="fas fa-arrow-right"></i></b> button to preview the slide.</li> 
                                     <li>Click on <b>Finish Upload</b> to complete the process and post the slide to caMicroscope.</li> 
                                 </ul>
diff --git a/apps/table.js b/apps/table.js
index a84ee48aa..6ae19530c 100644
--- a/apps/table.js
+++ b/apps/table.js
@@ -714,8 +714,22 @@ function fileNameChange() {
   const fileName = fileNameInput.val();
   let newFileName = fileName.split(' ').join('_');
   fileNameInput.val(newFileName);
-  let fileExtension = newFileName.toLowerCase().split('.').reverse()[0];
-  if (!allowedExtensions.includes(fileExtension)) {
+  let fileParts = newFileName.split('.');
+  let fileExtension = fileParts.length > 1 ? fileParts.reverse()[0].toLowerCase() : null;
+  if (!fileExtension) {
+    fileNameInput.addClass('is-invalid');
+    let fDiv = document.getElementById('filename-feedback0');
+
+    if (!fDiv) {
+        fileNameInput.addClass('is-invalid');
+        let fDiv = document.createElement('div');
+        fDiv.classList.add('invalid-feedback');
+        fDiv.id = 'filename-feedback0';
+        fDiv.textContent = 'The file name you provided is incompatible. File names should follow this format "filename.ext"';
+        fileNameInput.parent().append(fDiv);
+    }
+
+  } else if (!allowedExtensions.includes(fileExtension)) {
     fileNameInput.addClass('is-invalid');
     let fDiv = document.createElement('div');
     fDiv.classList.add('invalid-feedback');
@@ -734,6 +748,8 @@ function fileNameChange() {
     }
   }
 }
+
+
 function switchToFile() {
   $('.urlUploadClass').css('display', 'none');
   $('.fileInputClass').css('display', 'block');