Doesn't work – doesn't upload

It gave a warning when I didn’t have permissions configured properly, which was good, and there was a help page that enabled me to work through the process of setting up a policy to get it right.

But it doesn’t upload to S3 and doesn’t change the URL of the uploaded media. There is no message saying it wasn’t able to upload. There is no information about how to troubleshoot, and there doesn’t appear to be a prospect of getting any.

This sort of thing CAN work. A few years ago I had success with an earlier version or different plugin that did the same thing, I’m not sure which. But this one isn’t working. I’m doing it with a simple, test installation to avoid other plugins that might complicate or interfere.