It is possible to add <a href="https://www.metaslider.com/docs/video-captions-for-local-videos/">video captions</a> to both External and Internal Video slides created with <a href="https://www.metaslider.com/upgrade/">MetaSlider Pro</a>. This feature uses VTT files to add captions. There is a “CC” button in the toolbar that viewers can use to control the captions.