Plugin fails to download the image if it contains spaces in filename

Here’s a quick fix:

$dir = wp_upload_dir();
$dirname = 'featured_image';
$full_path = $dir['basedir'].'/'.$dirname;
$baseurl = $dir['baseurl'].'/'.$dirname;
$filename = explode('/',$file_url);
$file_split = count($filename);
$nofun_allowed = preg_replace('/[^a-z0-9._-]/', '-', $filename[$file_split-1]);
$filepath = $full_path.'/'.$nofun_allowed;
$fileurl = $baseurl.'/'.$nofun_allowed;
if(is_dir($full_path)){
    $smack_fileCopy = copy($file_url,$filepath);
}

I use preg_replace because it’s easier then url-encode/decode and the original filename is not really needed.

Here’s a copy of what I’ve come up to: http://ge.tt/37jlxed/v/0?c

Your filenames probably contain [only] non-ascii characters (like Chinese or something) and what I basically do is to replace all non-alphanum with dashes to there are no spaces or other characters that need to be converted to %20 (or the corresponding hex representation).

An additional improvement that would be also needed is to add a timestamp to the filenames. It’s needed because the plugin doesn’t check the uniqueness of the filename right now and by uploading an image with the same filename it would get overwritten.

Here’s an example: http://pastebin.com/raw.php?i=gce5UdQJ

what’s the original url/filename that you’re trying to upload?