Update : Now Upgraded to 2.2.2 before it was 2.1.2
I am trying to figure out why thumbnail role suddenly missing when i try to edit a product from admin and want to change thumbnail image also for new products thumbnail role not showing please see attached image
- From Magento 2 admin go to products->catalog try to edit any product
- Click Images and Videos Tab
- Select any image which i want to assign as thumbnail image a popup appears with roles but thumbnail role is not here also same happens for add new product see attached image for details.
please advance thanks for help.