Leave this blank and JoomGallery will fill in a default value, which is the title in lower case and with dashes instead of spaces. Additionally the ID of the image will be added to ensure uniqueness. You may enter the Alias manually. If you do so please use lowercase letters and hypens (-). No spaces or underscores are allowed. The Alias will be used in the SEF URL. Default value will be a date and time if the title is typed in non-latin letters.