Changes lost after upgrade

Hello, in the previous topic I was indicated to use the amp_post_template_file to avoid the reset after the update of the plugin. But I still do not understand how to solve this, can you help me with more details please?

the code indicated in the previous topic is this:

private function verify_and_include( $file, $template_type ) {
		$located_file = $this->locate_template( $file );
		if ( $located_file ) {
			$file = $located_file;
		}
		$file = apply_filters( 'amp_post_template_file', $file, $template_type, $this->post );
		if ( ! $this->is_valid_template( $file ) ) {
			/* translators: %1$s is template file, %2$s is 'WP_CONTENT_DIR' string. */
			_doing_it_wrong( __METHOD__, sprintf( esc_html__( 'Path validation for template (%1$s) failed. Path cannot traverse and must be located in <code>%2$s</code>.', 'amp' ), esc_html( $file ), 'WP_CONTENT_DIR' ), '0.1' );
			return;
		}
		do_action( 'amp_post_template_include_' . $template_type, $this );
		include $file;
	}

I’m not understanding what I should do.