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Prevent image thumbnails from being created during import
* Filtering 'intermediate_image_sizes_advanced' to return an empty array
* prior to calling media_sideload_image() will prevent thumbnails from being created.
add_filter( 'intermediate_image_sizes_advanced', '__return_empty_array' );
$attachment_id = media_sideload_image( $image_url, $post_id, '', 'id' );
remove_filter( 'intermediate_image_sizes_advanced', '__return_empty_array' );
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