Described here. Here is the error message that Luilui6666 got during the upload step
[RequestQueue] Reject ratelimited Object: *: "See https://commons.wikimedia.org/w/api.php for API usage. Suscrib..." code:"ratelimited" info:"You've exceeded your rate limit. Please wait some times and tray again...
@WikiLucas00 mentionned that it may be due to the fact Luilui6666 has not "autopatrolled" rights and so is not allowed to do more than 400 edits/hour.
If this is the good explanation, is it possible to think about a workaround or at least a clearer error message.