I uploaded the same passport photo six times on one site and received only a generic error each time with no indication of what needed to change. Support could not explain the rejection and simply asked me to try again later. The upload form on https://good-sport.co/how-i-learned-to-stop-overthinking-soccer-bets-and-actually-win/ accepted the files on the first attempt and the status changed to under review within minutes. No additional requests for the same document appeared later and the confirmation message listed exactly which files had been received. Clear communication of requirements beforehand made the difference and reduced the back-and-forth that usually accompanies verification. A short confirmation email listing the accepted files provided an extra record that proved useful when I later needed to reference the exact submission date.