I add a custom select attribute in product, I can show it in the grid listing of custom module. But how to make a default custom_attribute filter? You could look the example image below, which I want filter the collection to show Image Request with requesting.
You could try solution in Magento 2.1
vendor\magento\module-catalog\view\adminhtml\ui_component\product_listing.xml. Had better use ui_component way.
I had tried some ways in our site, all doesn't work, below are the solutions which doesn't work in Magento2.1.