Add MAX image size to srcset

  • Hello,
    I’m trying to configure the the_post_thumbnail() srcset output so that it doesn’t use the ‘full-size’ image by default (in some cases 8MB). I’ve followed the guide here but doesn’t have the desired result:
    https://www.developersq.com/add-custom-srcset-values-for-responsive-images-wordpress/

    Ideally, if the screen width is larger than 1920px, use image size ‘hero_header_x2’ which I’ve added in my functions.php and NOT the full size image.
    add_image_size( ‘hero_header_x2’, 1920, 840, true );

    Any help would be appreciated!
    Harv

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