Do not allow chat uploads if secure_media is enabled

Continuing the discussion from 2.9.0.beta9: Security fix, bug fixes and more:

Why is this disallowed? In earlier versions it seemed to work fine with secure media.

Secure Uploads in Chat aren’t supported at the minute, so it made that setting a little misleading. There’s more detailed info in the commit itself, as well as a workaround if you have server access: :+1:


Thanks @JammyDodger . Just noting as well that I am queued up on making secure media work with more areas, including chat, later in the year.