To upload your video to WordPress.tv, you will need to make sure that your converted video files are under 1GB in size. If the files you created in your video editing app are over this size limit, you can use another open-source app called Handbrake to compress them so that they can be uploaded. Follow along with this video to see how you can compress your video files
You can download Handbrake for your OS here: https://handbrake.fr/downloads.php