These are things that guys have been dealing with long before us. There are plenty of posts here on this topic.

I learned from them myself and they helped me a lot to understand how to do what and where. Unfortunately, no one has made a specific procedure and instructions yet. I think that's how they keep their "know how" :)

https://unacms.com/d/remote-storage-1708

https://unacms.com/d/remote-storage-on-dedicated-server

https://unacms.com/d/serious-problem-with-urls-and-files-in-the

https://unacms.com/d/migrating-to-wasabi-s3