When the system shows cast icon, it means the screenshot begins. Until now, it works on most devices. You might try this, when you first screenshot, it will ask for screenshot permission. If you don't see the dialog, please uncheck the "auto confirm screenshot permission" in "screenshot" from fooView settings and retry.
Also you can enable "developer mode" from fooView settings, then "root screenshot" to try another way, it uses root method instead of cast method.
If it still doesn't work, please mail to us
[email protected], we will look into the issue.
Thanks!