无法在codeigniter中显示大写字母文件名

I have uploaded multiple files in CodeIgniter and it was working fine in localhost but when I upload it live server then those image doesn't display that name is in capital letter. I successfully store lower case file in a database but in the folder(where file store) I couldn't change the file name in lower case(i think that is the problem). here is my controllerI have uploaded multiple files in CodeIgniter a