Thank you very much, now it all works fine!
What surprised me is that only from a certain point on it works like that: the first time I costumized the logo it just uploaded it the original size and only later on it started forcing the crop. I’d suggest cropping would be only a suggestion, and to leave a ‘Keep the original size’ button available, or at least indicate how to change recommended sizes (now it’s not recommended, it’s forced).
Anyway, thank you very much for availability 😉