Hello, Does anybody know why python documentation in epub format (https://docs.python.org/3/archives/python-3.12.1-docs.epub) cannot be send to Kindle ebook reader using email .....@kindle.com or using www page https://www.amazon.com/sendtokindle ? Is there any error in the file format or is the error on Amazon's side? About an hour after sending the file, I always receive an email with the following content: Dear Customer, A document, sent at 03:15 PM on Fri, Dec 15, 2023 GMT, could not be delivered due to a service error. We apologize for the inconvenience. Please try sending your document(s) again later. To learn more about sending documents to Kindle, please visit our help page. By downloading or using Send to Kindle, you agree to the terms here. Regards, Amazon Kindle Support