Q:

Magento Custom Category Attribute File

Is there anyway to upload .flv extension on magento custom category attribute? 

I have this certain file upload, and it's front-end input is file,

Originally it's image, but I changed it to file, but it still doesn't work.  
It does not upload the video to any of the media folder on Magento. 
Is there any way to upload video on file upload Magento? 

A:

You should create own backend model (some_module/category_attribute_backend_file) see mine example:
1.Your category attribute installer:
$installer = $this;
$installer->startSetup();
$installer->addAttribute('catalog_category', 'custom_flv', array(
    'group'                    => 'General',
    'label'                    => 'Some File',
    'input'                    => 'image',
    'type'                     => 'varchar',
    'backend'                  => 'some_module/category_attribute_backend_file',
    'global'                   => Mage_Catalog_Model_Resource_Eav_Attribute::SCOPE_STORE,
    'visible'                  => true,
    'required'                 => false,
    'user_defined'             => true,
    'order'                    => 20
));
$installer->endSetup();

2.\app\code\local\Some\Module\Model\Category\Attribute\Backend\File.php
class Some_Module_Model_Category_Attribute_Backend_File extends Mage_Eav_Model_Entity_Attribute_Backend_Abstract
{
    public function afterSave($object)
    {
        $value = $object->getData($this->getAttribute()->getName());

        if (is_array($value) && ! empty($value['delete'])) {
            $object->setData($this->getAttribute()->getName(), '');
            $this->getAttribute()->getEntity()
                ->saveAttribute($object, $this->getAttribute()->getName());
            return;
        }

        $path = Mage::getBaseDir('media') .  DS . ' catalog' .  DS . ' category' .  DS;
        try {
            $uploader = new Mage_Core_Model_File_Uploader($this->getAttribute()->getName());

            $uploader->setAllowedExtensions(array('flv','pdf','doc','txt','sql'));
            $uploader->setAllowRenameFiles(true);
            $result = $uploader->save($path);
            //allowed extensions here
            $object->setData($this->getAttribute()->getName(), $result['file']);
            $this->getAttribute()->getEntity()->saveAttribute($object, $this->getAttribute()->getName());
        } catch (Exception $e) {
            if ($e->getCode() ! = Mage_Core_Model_File_Uploader::TMP_NAME_EMPTY) {
                Mage::logException($e);
            }
            return;
        }
    }
}

3./app/code/local/Some/Module/etc/config.xml
<global>
    <resources>
        <some_module_setup>
            <setup>
                <module>Some_Module</module>
                <class>Mage_Catalog_Model_Resource_Eav_Mysql4_Setup</class>
            </setup>
        </some_module_setup>
    </resources>
    <! --another nodes -->
 </global>

