Yesterday's note told how a new server that didn't set its own S3 locations inherited defaults pointing at rss.chat's folders. As of this version those defaults are gone: rssS3Path, rssFeedUrl, opmlS3Path, and opmlListUrl start as undefined, and your config.json supplies the real values — see Feeds on S3 in config.md. rss.chat's own config now sets its four values explicitly, the same as every other install. (rssFilename keeps its default, rss.xml — that one is right for every server.)
A detail that made this easy to verify: the server rebuilds its subscription list, subs.opml, on startup. Restart with the new settings and the file appears at its new address right away — no waiting for a post to trigger a rebuild.