...
A message popup is a Popup containing critical important information such as a warning, error message, or help text.
...
A message popup is very intrusive. Use it only for important messages or long help messages. For lower-priority messages → use a Toast.
Keep the title short and informative.
Keep the message text short and informative.
A common use is when the user tries to leave a page without saving their work. In this case, a warning popup will appear:
  |
Design
Zeplin link | Screen thumbnail |
|---|---|
 |
...