You made a form in adminhtml with upload file but in the controller the $_FILES var is hopelessly empty ?
You probably forgot to add “‘enctype’ => ‘multipart/form-data’,” on your form declaration
example :
file : /app/code/local/Adin/Shipping/Block/Adminhtml/Delivery/Cost/Import/Edit/Form.php
protected function _prepareForm() { $form = new Varien_Data_Form(array( 'id' => 'edit_form', 'action' => $this->getUrl('*/*/save', array('id' => $this->getRequest()->getParam('id'))), 'method' => 'post', 'enctype' => 'multipart/form-data', )); $fieldset->addField('fichier', 'file', array( 'label' => $helper->__('Data file'), 'value' => 'upload', 'name' => 'fichier', 'after_element_html' => $helper->__('<small>File from carrier</small>'), 'required' => true, ));