Open Drupal's media library from a media option of the component selected in the editor (the "Add media" button under the option's label), and wait for the dialog. Continue with "I upload ... to the media library ..." or the core pack's "I select the media ..." and "I insert the selected media".
Examples
When I open the media library of the Canvas component option "Image"
And I open the media library of the Canvas component option "Image"
When we open the media library of the Canvas component option "Video"
And we open the media library of the Canvas component option "Logo"
Given I open the media library of the Canvas component option "Background image"Pattern
When(/^(I |we )*open the media library of the Canvas component option "([^"]*)"$/, …)Part of @webship-js/drupal-cms-steps (github.com/webship/drupal-cms-steps), a step pack for Webship-js 2.0.x.