Problem: How to display author gravatar image
Solution: To display the author's aravatar image, you need to add custom shortcode to your current theme's functions.php file.
You can find proposed solution, in this case, with the following reply: => https://toolset.com/forums/topic/how-do-i-display-an-authors-gravatar-image-in-content-template-used-for-an-archi/#post-854160
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