Media Helpers 
This helper provides utility methods to work with media assets.
getDefaultFolder 
The getDefaultFolder method is originally copied from shopwares core and made public for use in fixtures.
It searches for the default folder for any given entity (e.g., product) and returns the media folder entity or null if not found.
php
<?php
class MyFixture extends Fixture {
    public function load(): void {
        $productFolder = $this->helper->Media()->getDefaultFolder('product'); 
    }
}upload 
This method "uploads" a real file within Shopware. It takes a real file path and uploads it as a complete media entity:
php
<?php
class MyFixture extends Fixture {
    public function load(): void {
        $folderId = $this->helper->Media()->getDefaultFolder('product')?->getId();
        $this->helper->ensureNotEmpty($folderId);
        $this->helper->Media()->upload( 
            mediaId: '019021d21d9571309bdc48db825032f4', 
            folderId: $folderId, 
            fileName: '/path/to/the/real/file.png', 
            extension: 'png', 
            contentType: 'image/png'
        ); 
    }
}