Fixed filenames in download start with . what leads to invisible files

persistence-service-v1/persistence-service-server-v1/src/main/java/com/iqser/red/service/peristence/v1/server/service/download/DownloadPreparationService.java

@@ -149,7 +149,7 @@ public class DownloadPreparationService {
     private String removeExtension(String fileName) {
         var index = fileName.lastIndexOf(".");
         if (index > 0) {
-            return fileName.substring(index);
+            return fileName.substring(0, index);
         } else {
             return fileName;
         }