Just a question. I see how this preserves the old url, but I see nowhere that this redirects to the file now. The user would just get a 404 at the old address. Am I missing something?
Is step #2 still necessary from the OP?
2. Using a function (in functions.php) to add a rewrite rule which rewrites uploads directory to S3 bucket URL.
I have a very similar setup to the OP, but I am having problems getting the URL setup as needed. Would simply like the original WP urls to redirect to the new s3 bucket address. How would I do this?
Thank you!