So I did a test again.
I let the app auto range ch 2; it correctly picked Voltage AC and 600V range.
I turn on logging, note that the LED on the meter is blinking with activity and I hit the home button.

After a while, the blinking on the meter turns off (aka it stops logging).

I pull up the app again and the meter screen is “frozen” (not getting updates.
I back out to the list of meters to see the meter in “disconnected” status.
I select that meter again and additional weirdness: Ch2 is set to “Voltage DC”, range autos to 60V, and logging is “off”.
When I changed the range to 600V (manual) and then go to select “Voltage AC”, the app bumps the range back to “auto” (which then overloads since it goes to 60V).

I’ll check to see what it logged in just a moment.

On a side note, is there a way to tell the meter (independent of app) to start logging and type/range with a config file on the microsd?