Windows 10 build 21370

Windows 10 build 21370 is the sixteenth Insider Preview build of Cobalt. This build was released on 29 April 2021 to all Windows Insiders on the Dev Channel.

Bluetooth streaming
The playback device selection in the taskbar's volume flyout has been changed to show one audio endpoint now only for Bluetooth headsets. Their volumes can now also be directly adjusted from there. In addition, support for the AAC (Advanced Audio) codec has been added.

Touch keyboard
The animation when the flyout is invoked has been changed to be smoother when appearing with UWP apps whose content reflows while it appears. When invoked from the Run dialog, it has received an update to show a backlash for easier typing of addresses in the text bar.

Other changes

 * The icons in File Explorer's address bar have been updated.
 * The options to show or hide the touch keyboard, Pen, Search, and Task View taskbar icons have been moved once again from the taskbar right click menu to Settings → Personalization → Taskbar.

Camera Settings

 * The Camera app does not respect the brightness adjustments made to a camera under its respective page.

General

 * The update process to this build has a chance of hanging for extended periods of time.
 * Certain parts of Search, including the File Explorer search box, are not displaying correctly in the dark theme.
 * Windows Subsystem for Linux (WSL) users might notice a slow launch performance for File Explorer.
 * Some WSL instances might fail to launch with a  error message.