if you allow true in $config[‘csrf_protection’] = true; within config file and you are also add autoload form than we can use.

Step 1. within config folder autoload file upload form helper

$autoload[‘helper’] = array(‘url’, ‘file’,’form’);

Step 2. $config[‘csrf_protection’] = true;

Step 3. while uploading in view folder

<?php echo form_open_multipart(‘admin/file_upload’); ?>

Otherwise, you can use only

$config[‘csrf_protection’] = false;

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