Capability

gistfile1.txt

add_filter(
	'user_has_cap',
	function( $allcaps, $caps, $args, WP_User $user ) {
		$current_user = wp_get_current_user();
		$requested_cap = $args[0];
		if ( $user->ID === $current_user->ID && in_array( 'customer', (array) $current_user->roles ) ) {
			if ( 'upload_files' === $requested_cap ) {
				return $allcaps;
			}
		}
		return $allcaps;
	},
	10,
	4
);