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Product Thumbnails are not showing in backend

Established Member

Product Thumbnails are not showing in backend


I have migrated Magento 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,