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Why does the F2 Ultra UV not communicate with the AP2 via its built-in Bluetooth? 

The result is that Auto mode on the AP2 does not work.
I have the bluetooth dongle that comes with the AP2 but there is nowhere indicated to plug it in and, anyway, as the F2 Ultra UV has built‑in Bluetooth, unlike the F2 Ultra, it shouldn't need it.
Has anyone else had this issue and has it been resolved?