根据问题的原因，有两种不同的解决方案。

在您的情况下，这似乎不是上载问题。我宁愿尝试添加the following plugin

<?php
/*
Plugin Name: Default to GD
Plugin URI: http://wordpress.org/extend/plugins/default-to-gd
Description: Sets GD as default WP_Image_Editor class.
Author: Mike Schroder
Version: 1.0
Author URI: http://www.getsource.net/
*/

function ms_image_editor_default_to_gd( $editors ) {
    $gd_editor = \'WP_Image_Editor_GD\';

    $editors = array_diff( $editors, array( $gd_editor ) );
    array_unshift( $editors, $gd_editor );

    return $editors;
}
add_filter( \'wp_image_editors\', \'ms_image_editor_default_to_gd\' );
?>