Ensure that you have some filters enabled
Open something with Atto
Open the manage media plugin
Search for some media using the Browse Repositories button
Select a video from YouTube/Vimeo/etc
Confirm that a preview was shown
Find a video (one which a filter will automatically apply to) and copy paste/the URL in (e.g. YouTube again)
Confirm that a preview was updated
Change the URL to something invalid and blur the field (e.g. move to the next field)
Confirm that the preview was removed
The media plugin is missing a preview
has a non-specific relationship to
MDL-55324atto_media should use HTML5 video/audio tags, allow to set multiple sources, tracks, poster and other properties
Closed
has been marked as being related by
MDL-44244Atto: Video previews should be displayed directly in the editor