The Upload control is identical to the Image control, the only difference is that it allows uploading more file types.
Example
new \Kirki\Field\Upload(
[
'settings' => 'upload_setting',
'label' => esc_html__( 'Upload Control', 'kirki' ),
'description' => esc_html__( 'The saved value will the URL.', 'kirki' ),
'section' => 'section_id',
]
);Usage
<?php
$file_url = get_theme_mod( 'upload_setting', '' );
printf( esc_html__( 'URL of uploaded file: %s', 'kirki' ), $file_url );
?>