Media

// Disable Auto Generated Images Sizes
add_action('intermediate_image_sizes_advanced', 'disable_image_sizes');
function disable_image_sizes($sizes) {
	
	//unset($sizes['thumbnail']);    
	//unset($sizes['medium']);      
	//unset($sizes['large']);        
	unset($sizes['medium_large']);
	unset($sizes['1536x1536']);    
	unset($sizes['2048x2048']);
	
	return $sizes;
	
}
add_action('init', 'disable_other_image_sizes');
function disable_other_image_sizes() {

	remove_image_size('post-thumbnail'); 
	remove_image_size('another-size');
}

add_filter('big_image_size_threshold', '__return_false');

Display the file size in a separate column in the Media screen

add_filter( 'manage_upload_columns', function ( $columns ) {
	$columns ['file_size'] = esc_html__( 'File size' );

	return $columns;
} );

add_action( 'manage_media_custom_column', function ( $column_name, $media_item ) {
	if ( 'file_size' !== $column_name || ! wp_attachment_is_image( $media_item ) ) {
		return;
	}
	$filesize = size_format( filesize( get_attached_file( $media_item ) ), 2 );
	echo esc_html( $filesize );

}, 10, 2 );

add_filter( 'manage_posts_columns', function ( $columns ) {
	// You can change this to any other position by changing 'title' to the name of the column you want to put it after.
	$move_after     = 'title';
	$move_after_key = array_search( $move_after, array_keys( $columns ), true );

	$first_columns = array_slice( $columns, 0, $move_after_key + 1 );
	$last_columns  = array_slice( $columns, $move_after_key + 1 );

	return array_merge(
		$first_columns,
		array(
			'featured_image' => __( 'Featured Image' ),
		),
		$last_columns
	);
} );

add_action( 'manage_posts_custom_column', function ( $column ) {
	if ( 'featured_image' === $column ) {
		the_post_thumbnail( array( 300, 80 ) );
	}
} );

function add_alt_text_column($columns) {
    $columns['alt_text'] = 'Alt Text';
    return $columns;
}
add_filter('manage_media_columns', 'add_alt_text_column');

// Display alt text with colored dot in the custom column
function display_alt_text_column($column_name, $attachment_id) {
    if ($column_name === 'alt_text') {
        $alt_text = get_post_meta($attachment_id, '_wp_attachment_image_alt', true);
        $file_type = wp_check_filetype(wp_get_attachment_url($attachment_id));
        $image_types = array('jpg', 'jpeg', 'png', 'webp', 'avif', 'gif', 'svg');

        if (in_array($file_type['ext'], $image_types)) {
            if (!empty($alt_text)) {
                echo esc_html($alt_text);
            } else {
                echo '<div style="display:flex;align-items:center;"><p style="margin:0;color: red;font-size: 48px;">&bull;</p><p style="margin-top:1.1rem;padding-left:1rem;font-weight:700;">Missing Alt text!</p></div>';
            }
        } else {
            echo '<div style="display:flex;align-items:center;"><p style="margin:0;color: royalblue;font-size: 48px;">&bull;</p><p style="margin-top:1.1rem;padding-left:1rem;font-weight:700;">N/A</p></div>';
        }
    }
}
add_action('manage_media_custom_column', 'display_alt_text_column', 10, 2);

if ( current_user_can('contributor') && !current_user_can('upload_files') )
     add_action('admin_init', 'allow_contributor_uploads');      
     function allow_contributor_uploads() {
          $contributor = get_role('contributor');
          $contributor->add_cap('upload_files');
     }

add_action(
	'template_redirect',
	function () {
		global $post;
		if ( ! is_attachment() || ! isset( $post->post_parent ) || ! is_numeric( $post->post_parent ) ) {
			return;
		}

		// Does the attachment have a parent post?
		// If the post is trashed, fallback to redirect to homepage.
		if ( 0 !== $post->post_parent && 'trash' !== get_post_status( $post->post_parent ) ) {
			// Redirect to the attachment parent.
			wp_safe_redirect( get_permalink( $post->post_parent ), 301 );
		} else {
			// For attachment without a parent redirect to homepage.
			wp_safe_redirect( get_bloginfo( 'wpurl' ), 302 );
		}
		exit;
	},
	1
);