Hi Rachel,
Thank you for your email. I am trying to recreate the error from my end to understand where the problem is emanating from. The “Maximum size for new files: 500MB, maximum attachments: 9” should be information and not an error. I managed to download the file you sent, and I have tried attaching it as well (see attached). It seems to work well from my end. However, I will continue to look into the issue.
Best Regards,
Peter