I haven't used AWS. Is there a reason you can't publish and update from within Muse?
Thanks for your reply. Amazon S3 is static only - it's not dynamic at all. You can check out this link: FTP/SFTP access to an Amazon S3 Bucket - Stack Overflow
The response I posted below is from this link. Cloudberry makes it really simple to upload files to S3, but is it "wrong" or will it harm my SEO to update a website in this way?
Well, S3 isn't FTP. There are lots and lots of clients that support S3, however.
It's unlikely to harm your SEO, unless you are making drastic changes to the site content or page names. Very often Muse needs to update the entire site content, if you add or remove pages, for example, as it needs to reflect the changes in internal links.