I have been using Samsung flow for a while with my Galaxy Note 9 and a Windows 10 laptop (Samsung brand).
When connected to Samsung Flow through Wi-Fi LAN and enabling the Smart View feature, the two ways that I can think of in order to hear the audio output of my Galaxy Note 9 are:
Connect Bluetooth Speakers with my Galaxy Note 9. This does not seem to work because when using the Smart View feature, Samsung Flow automaticlally routes the Note 9's audio to my laptop, and I don't think there is a setting to disable this routing.
Connect Bluetooth Speakers with my laptop. This is what should work, but I am not able to hear any of Note 9's audio. I can hear the Note 9's audio through other outputs that is not over Bluetooth (laptop's built-in speakers, wired earphones, etc.), but no luck through Bluetooth.
One partially working way that I found is:
Settings > Sounds and vibration > Advanced sound settings > Separate app sound
This feature allows me to route a single app's audio to a Bluetooth device, so in this case I can hear the audio when connected to Samsung Flow; however, it is limited to only one app. So when playing background music and a game simultaneously while connected to Samsung Flow, hearing the audio of both the music app and the game is not possible.
Has anyone had luck properly hearing the phone's audio over Bluetooth, when connected to Samsung Flow?