Fix client file upload not automatically naming files or showing image previews

post.php

@@ -7044,6 +7044,14 @@ if(isset($_POST['add_file'])){
     $client_id = intval($_POST['client_id']);
     $file_name = sanitizeInput($_POST['new_name']);
 
+    $extarr = explode('.', $_FILES['file']['name']);
+    $file_extension = sanitizeInput(strtolower(end($extarr)));
+
+    // If the user-inputted name is empty, revert to the name of the file on disk/uploaded
+    if (empty($file_name)) {
+        $file_name = sanitizeInput($_FILES['file']['name']);
+    }
+
     if (!file_exists("uploads/clients/$client_id")) {
         mkdir("uploads/clients/$client_id");
     }