ecoflow 50a hub

i have a dp3 with the 50a power hub. 1 how do I add it to the app and 2. will the ecoflow start charging from ac after the battery reaches my doc limit? the ac is coming from main gid panel not the panel the power hub is feeding. thanks. also why cant they make this to allow input if say you have an enphase also installed feeding the same backup panel. thanks