como subir imagen destacada desde formulario externo

Como podría subir una entrada con imagen destacada desde formulario externo? he logrado que la entrada se publique pero sin la imagen.

en function.php tengo este código:

function my_update_attachment($f,$pid,$t='',$c='') {
    wp_update_attachment_metadata( $pid, $f );
    if( !empty( $_FILES[$f]['name'] )) { //New upload
      require_once( ABSPATH . 'wp-admin/includes/file.php' );

      $override['action'] = 'editpost';
      $file = wp_handle_upload( $_FILES[$f], $override );

      if ( isset( $file['error'] )) {
        return new WP_Error( 'upload_error', $file['error'] );
      }

      $file_type = wp_check_filetype($_FILES[$f]['name'], array(
        'jpg|jpeg' => 'image/jpeg',
        'gif' => 'image/gif',
        'png' => 'image/png',
      ));
      if ($file_type['type']) {
        $name_parts = pathinfo( $file['file'] );
        $name = $file['filename'];
        $type = $file['type'];
        $title = $t ? $t : $name;
        $content = $c;

        $attachment = array(
          'post_title' => $title,
          'post_type' => 'attachment',
          'post_content' => $content,
          'post_parent' => $pid,
          'post_mime_type' => $type,
          'guid' => $file['url'],
        );

        foreach( get_intermediate_image_sizes() as $s ) {
          $sizes[$s] = array( 'width' => '', 'height' => '', 'crop' => true );
          $sizes[$s]['width'] = get_option( "{$s}_size_w" ); // For default sizes set in options
          $sizes[$s]['height'] = get_option( "{$s}_size_h" ); // For default sizes set in options
          $sizes[$s]['crop'] = get_option( "{$s}_crop" ); // For default sizes set in options
        }

        $sizes = apply_filters( 'intermediate_image_sizes_advanced', $sizes );

        foreach( $sizes as $size => $size_data ) {
          $resized = image_make_intermediate_size( $file['file'], $size_data['width'], $size_data['height'], $size_data['crop'] );
          if ( $resized )
            $metadata['sizes'][$size] = $resized;
        }

        $attach_id = wp_insert_attachment( $attachment, $file['file'] /*, $pid - for post_thumbnails*/);

        if ( !is_wp_error( $id )) {
          $attach_meta = wp_generate_attachment_metadata( $attach_id, $file['file'] );
          wp_update_attachment_metadata( $attach_id, $attach_meta );
        }

        return array(
          'pid' =>$pid,
          'url' =>$file['url'],
          'file'=>$file,
          'attach_id'=>$attach_id
     );
        // update_post_meta( $pid, 'a_image', $file['url'] );
      }
    }
}

y en la pagina donde se publica el formulario este:

if($_SERVER['REQUEST_METHOD'] == 'POST'):

        $titulo 	= $_POST  ['titulo'];
        $precio 	= $_POST  ['precio'];
        $descripcion    = $_POST  ['descripcion'];
        $url 		= $_POST  ['url'];
        $imagen_post    = $_FILES  ['imagen'];
        $autor		= get_current_user_id();

        $platos_id = wp_insert_post(array
                (
                'post_title'  	=> $titulo, 
                'post_type'	=> 'platos', 
                'post_content'  => $descripcion,
                'post_author'	=> $autor,
                'post_status'   => 'pending',
                )
              );
              $watch = wp_insert_post($platos_id);
                $att = my_update_attachment('watch_image',$watch);
                update_field( "imagen", $att['attach_id'],$watch );

                //Actualizar campos personalizados - función plugin empleado
                update_field( "field_5f5d3380b5a8d", $url, $platos_id );
                update_field( "field_5f5d339fddd49", $precio, $platos_id );

                my_update_attachment($f,$pid,$t='',$c='');

he tratado de hacerlo con ACF pero nada.

• Este debate fue modificado hace 3 años, 7 meses por jose64. Razón: Etiquetar código