如果对你有用的话，你可以用PHP下拉图像。您只需确保无论在何处“放置”图像，都需要具有写入权限。

我得到了下面的代码片段来处理您在上面放置的图像url。

// Remote image URL
$img_source = \'https://res.cloudinary.com/demo/image/upload/w_400,h_400,c_crop,g_face,r_max/w_200/lady.jpg\';

// Image path
// the tmp/ folder needs to have the correct write permissions.
$img_path = \'tmp/lady.jpg\';

// Save image 
$results = file_put_contents( $img_path, file_get_contents( $img_source ) );

// returns the number of bytes that were written to the file, or FALSE on failure.
echo \'<pre>\';
print_r($results);
echo \'</pre>\';

如果没有更多的信息，很难说出原因是什么，对于一个特定的答案，您可能希望显示您的代码。

以下内容将lady上传到媒体库：

$url = \'https://res.cloudinary.com/demo/image/upload/w_400,h_400,c_crop,g_face,r_max/w_200/lady.jpg\';
// $post_id = 0 to not attach to specific post
media_sideload_image( $url, 0 );

require_once(ABSPATH . \'wp-admin/includes/media.php\');
require_once(ABSPATH . \'wp-admin/includes/file.php\');
require_once(ABSPATH . \'wp-admin/includes/image.php\');

• https://codex.wordpress.org/Function_Reference/media_sideload_image
• https://developer.wordpress.org/reference/functions/media_sideload_image/