Modify php.ini File in cPanel
cPanel, modifying the php.ini file can also sometimes be done via the MultiPHP INI Editor tool. Under Software click on “MultiPHP INI Editor.”

MultiPHP INI Editor
Select your home directory (domain root) from the drop-down.

MultiPHP INI Editor home directory
Change the value of upload_max_filesize to something larger.

MultiPHP INI Editor upload_max_filesize