Referencing an image from theme settings

by Madam Adam   Last Updated December 26, 2017 12:07 PM

In a custom theme (Drupal 8.4.3) I would like to add a setting, where I can reference (not upload) an image to use as a background image. Like in a normal reference field, already uploaded images should be choosable; these images are stored in media entities. How can I build such a theme setting? I only found information about uploading images in theme settings.



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