Once you’ve filled out the page, it’s time to make a listing or profile page for your flash briefing. This process is the same as with any Alexa skill: give your briefing a short description, a long one and a profile image to use. After that, submit your skill and begin recording your content! When you upload new content to your audio host, it will automatically push to your flash briefing via RSS.
As of this writing, Amazon has thousands of sources for flash briefings. The sources they include can be hyper-local like your local news station. Amazon also has specific topics like tech or business, or general info. Many of these sources, like NPR, are podcasts provided by Tune-In. These briefings are audio files Alexa plays for you. Other sources like the AP news stories are read in Alexa’s voice. I wish Amazon told you which ones were audio files because her voice drones on after a while. I hope I get to change her voice like I can with Siri. Right now, you can just change the language to the English (UK) or German.
Note: Your Flash Briefing settings apply to all Alexa devices registered to your Amazon account, and all users in your home get access to the same Flash Briefing content. However, if you or anyone in your home has a voice profile, Flash Briefing automatically skips stories and news items you've already heard. To learn more, go to About Alexa Voice Profiles.