Reply to thread

We ran into the same issue.  The inability to easily override it via config.php seems like an odd choice.  S3 provides a variety of powerful tools for granularly adjusting permissions; XenForo just throws all of that out the window for no obvious benefit.  Even in the default, local filesystem use case, manually setting everything to public isn't likely to resolve permission issues because it doesn't change the owner.

That being said, there's nothing stopping you from extending XenForo's classes and overriding their Flysystem config; it's just cumbersome and less than ideal.  Eventually, someone is going to be bitten by the defaults, particularly when combined with XFAws.