Drupal 8.x

I have two site with the same Uuid
SiteA and SiteB

SiteA is fresh installation and export its configuration, all siteA is under git.
drush config-export myfolder -y where my folder is where I store my configuration

SiteB is clone of siteA and it has the same uuid of SiteB
drush config-import myfolder -y
I get this error

Greetings,

Trying to browse http://..... admin/content/files
I can see a list of my files but how can I modify the view to add a thumbnail of each file?
In Drupal 8.0.1 where are the thumbnails?

Kind Regards,

Hi,

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So i need some help or the right words i have to search for.

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Here is the code I tried:

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