Updated Drupal to 8.6. This goes with the following updates because it's possible...

[yaffs-website] / web / core / profiles / demo_umami / config / install / media.type.video.yml

langcode: en
status: true
dependencies: {  }
id: video
label: Video
description: 'A locally hosted video file.'
source: video_file
queue_thumbnail_downloads: false
new_revision: true
source_configuration:
  source_field: field_media_video_file
field_map: {  }