and it seems that something arrives but the data is corrupted,
We're sorry, but there was a problem with processing your product called '5 x STLGEN - 83690155'. It didn't pass all the checks that we run to make sure a design is printable. Here's the error message:
Invalid input file format
If you're stuck you can send an email to firstname.lastname@example.org with the file attached to the email and the error message, that way we can take a look at the file and help you solve your problem.