Media Library Integration — a practical guide to WordPress media library plugin with clear examples you can reuse in real projects.
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Short description
Use `media_handle_upload` or sideload helpers so files become attachments with metadata.
media_handle_upload
require_once ABSPATH . 'wp-admin/includes/image.php';
require_once ABSPATH . 'wp-admin/includes/file.php';
require_once ABSPATH . 'wp-admin/includes/media.php';
$attachment_id = media_handle_upload('acme_file', 0);