sound great:)

that should be ok under 220V.

it should be more safe to access FTP server with only one username. Don't think more users will be available.

you may go to tplink official website to check whether the printer is on their compatibility list. Besides, your router should work at wireless router mode and the devices should connect to the...

disconnect tplink network to have a try or restart the devices. you may check whether there is WAN ip address on the router to tell the connection is working or not.

if you open app firstly when it's connecting to other wifi, we have to reopen app after we connect to Deco wifi. It requires the client connects to Deco wifi can do any settings.