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Schema Default Image is an extension for the Schema plugin, it extend Schema functionality by adding ability to set a default image, which will be used in schema.org markup output if no Featured image is attached to the post.
Note: This extension requires Schema plugin to be installed and activated on your site.
Google requires every Article and BlogPost to have an image property within its schema.org markup, otherwise you will get an error in Rich Results testing tool and Search Console.
Also, Google recommends uploading a high quality image, it shouldn’t be smaller than the recommended image size.
Check out the Schema Free Plugin page for more info and documentation.
Looking for more features? Check out the Premium Schema Plugin.