Nano Every not working with Create Chrome app

I have a Chromebook running ChromeOS 76. Arduino Create app installed and working with a Uno board. However, not with a Every board (an original from Arduino, not a copy). The Every is viewable in chrome://devices-log, so the hardware is not the problem I guess. In https://create.arduino.cc/editor, the Every is not auto-detected. It is available in the "partially supported - verify only" list. On the pages of ArduinoCreate and the OnlineIDE, it says that every board is fully supported out-of-the-box. But not so on Chromebooks? Any ideas?