When you want to associate an image to a post which already has its own featured image, you have to use a custom field : you upload an image just as if you wanted to add an image inside your post, but then you just copy the image URL, click cancel, and put the image URL in the custom field value : burdensome.
Is it possible to do that automatically without any need to copy and paste any URL, like having another featured image, but with a specific name and having the properties of a custom field ?
I hope my question is understandable.