Preview of the uploaded images are not showing on the node add/edit page but images are uploaded correctly. We're using Lightning Acquia distribution and using Entity browser for the image field.
What could be the possible issue?
This is a known issue in the current version of entity_browser that ships with Lightning. Upgrade the entity_browser module to 8.x-1.0-alpha10 or later to resolve the issue.
If you have used composer to install, simply update the drupal/entity_browser module via composer.
What could be the possible issue?
The /sites/default/files folder may not have the required permissions to create new files. Thus, the thumbnails which are image styles cannot be created.