@Zei2021 again, I'm not sure what you're asking. AWS and cloudfront don't generate your feed file. They simply house the files necessary to define your channel and all of it's content. You are responsible for creating and uploading your feed file.
@Baradanikto @What’s your suggestion for generating my mrss feed file. How did you generate yours?
@Zei2021 first, I would suggest you consider defining your feed file using Json instead. Json feeds provide more features.
Second, I use the software in my signature below. However, if you browse this forum, you'll find other channel developers offering paid solutions.