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Product Thumbnails are not showing in backend

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Regular Visitor

Product Thumbnails are not showing in backend

Hi,

I have migrated Magento 1.9.2.2 to Magento 2.1.6 with the help on the Data Migration Tool.

I moved manually the media files following the documentation.

 

The problem is that in the backend product list I only see the Magento thumbnail placeholder (gray icon). If I enter the product I can see the images attached.

 

I can only see the thumbnail if I edit the product and hit save. Then the thumbnail is shown in the list.

 

But I don't want to do this for 3k+ products.

 

Do you know what could cause this issue and how I can solve it?

 

Thanks very much,

Louque