prova così

Codice PHP:
//...
 $bnfile = basename( $_FILES['uploadedfile']['name']); 
$target_path= $target_path . $bnfile;                   
if(move_uploaded_file($_FILES['uploadedfile']['tmp_name'], $target_path)) {      
echo "Il file ".$bnfile." è stato caricato";          
} else{      
echo "C'è stato un errore nell'upload del file, riprova!";      
} ?>