The s3folderName pref in Radio2 is set to /radio2/ which is a problem when you're accessing files on the local server, which is now the default setup.
This is because the name of the site used to access the CMS is also /radio2/. So it can't locate the feed. It's writing it correctly. Everything else appears to be working.
The default is changed to /blogs/ which matches the River2 default which is /rivers/.
Also the pref is mis-named, since we're not writing this to S3, but I'm not going to fix that, it causes no harm.