Doesn't play

I’m sorry this is so late. This plugin is no longer in active development. If you’re still having this problem (and using this plugin), you might make sure you can get to the file using the browser’s address bar – just to make sure WordPress is serving up the video correctly. I suspect your server is not configured to server .mp4 video files. Check here (https://www.paulund.co.uk/change-wordpress-upload-mime-types) for instructions on enabling the correct mime types.