Record stream directly to S3 with AWS Multipart Upload?

Yes, using the configuration in that article, a new recording is moved automatically. That happens when the write process completes, not when recording stops.

If you want more control, you can use the IMediaWriteActionNotifiy interface onWriteComplete handler:

You need the Wowza IDE to build application modules

The source code for the automated ModuleMediaWriterFileMover is here:

Richard