@abu. Thanks for posting. The diagnostics show the Fileinfo extension for PHP is not defined/enabled. Once Fileinfo is enabled, you don’t need any of the others to exist (mime_content_type, escapeshellarg, exec, shell_exec).
You did the right thing by contacting the hosting company. they will need to enable the fileinfo extension for PHP, which is normally enebaled by default since PHP 5.3. You can read and reference it from the PHP documentation link (http://php.net/manual/en/fileinfo.setup.php).