Well now I know what the dongle is for and I appreciate Blackview providing it. It adapts a standard microusb cable to the deep USB-C phone connector.
Yes, but never to be used for charging. Can cause fires. Micro USB cables are not power rated for the current these big battery USB-C phones draw. Trying to charge a Blackview using the little adapter is like connecting a fire-hose to your home water supply and expecting the taps to withstand the higher pressure. Only use adapter for data connections.
I had a genuine Samsung charger, cable and phone...it melted and started smoking.
As for the longer pronged connecter, where can one buy the 3.5mm one...I don't see it listed anywhere, Gearbest, Ali etc. I think this phone is not ready for the public from a software perspective.