How to add File Size admin column in WordPress Media Library

Add the following in child theme’s functions.php:

add_filter( 'manage_media_columns', 'sk_media_columns_filesize' );
/**
 * Filter the Media list table columns to add a File Size column.
 *
 * @param array $posts_columns Existing array of columns displayed in the Media list table.
 * @return array Amended array of columns to be displayed in the Media list table.
 */
function sk_media_columns_filesize( $posts_columns ) {
	$posts_columns['filesize'] = __( 'File Size', 'my-theme-text-domain' );

	return $posts_columns;
}

add_action( 'manage_media_custom_column', 'sk_media_custom_column_filesize', 10, 2 );
/**
 * Display File Size custom column in the Media list table.
 *
 * @param string $column_name Name of the custom column.
 * @param int    $post_id Current Attachment ID.
 */
function sk_media_custom_column_filesize( $column_name, $post_id ) {
	if ( 'filesize' !== $column_name ) {
		return;
	}

	$bytes = filesize( get_attached_file( $post_id ) );

	echo size_format( $bytes, 2 );
}

add_action( 'admin_print_styles-upload.php', 'sk_filesize_column_filesize' );
/**
 * Adjust File Size column on Media Library page in WP admin
 */
function sk_filesize_column_filesize() {
	echo
	'<style>
		.fixed .column-filesize {
			width: 10%;
		}
	</style>';
}
https://sridharkatakam.com/add-file-size-admin-column-wordpress-media-library/
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