I ran into an issue earlier (described in this video: • Building Boon.Land | status session | boon... ) in which the subdomain for my static files had an expired SSL certificate.
In this video, I fix an issue in which accessing certain files via URL from my computer was still leading to the same error, an HTTP 526 response.
In this case, the error was fixed by changing the encryption mode from Full (strict) to Full on Cloudflare, re-accessing the files from my computer, then reverting that setting change.
Part of me wishes I looked more into the root cause, but if it happens again, I'll learn from that