Re: I checked the "High priority notifications" box and now my LED flashes even when both sound and vibration are "off
Right, "high priority notifications" also require a sound / vibration and Aqua Mail has had code to set a "dummy" vibration pattern for those if necessary.
Re: I got the notification light back on the Galaxy S7 by Settings (Android, not AquaMail), Notifications, Advanced, AquaMail, then turn off Show Silently.
Yeah and the $64,000 question here is - what's the connection between "show silently" and the LED?
Did someone at Samsung or Google mix up "sound" and "vision"?
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As far as I remember, our current 1.15.0-dev build (under "Development builds") already has the workaround for LED on Android 7, the dummy zero-duration vibration if needed.