Living with both Apple and Android was always a hassle. QuickShare-AirDrop support finally made sharing files feel simple and convenient.
While the dangers of unencrypted traffic have receded with the widespread adoption of encrypted traffic, evil twin networks ...
If you insist on using your router's USB port, there are two important precautions to follow. First, only use it for non-critical files. Don't share or transfer anything sensitive through the port.