So I need to put a specific file with some specific text (location-> .well-known/acme-challenge/filename) where .well-known is at the publishing directory/source, so that I can obtain my SSL/TLS certificate from LetsEncrypt. However, once I try to create this, ALL links work except username.github.io/.well-known/acme-challenge/filename. If I modify .well-known or acme-challenge parts, the links work. I don't know why this is happening. Is there some cache somewhere I need to delete? I've run the links on private no-cache, no-cookies browsers too, they don't seem to work.