Sony ILCE-7S - Manual (Page 241)

Smartphone] may be canceled halfway. Charge the battery pack and try again.
[321] Troubleshooting Troubleshooting Wi-Fi
The shooting screen for [Smart Remote Embedded] is
not displayed smoothly./The connection between this
product and the smartphone is disconnected.
Data communication between this product and the smartphone may fail due to signal
conditions. Place this product closer to the smartphone.
[322] Troubleshooting Troubleshooting Wi-Fi
You cannot use One-Touch connection (NFC).
Place the (N mark) on the smartphone and the (N mark) on the product as close
together as possible. If there is no response, move the smartphone a few millimeters or
move the smartphone away from this product, wait more than 10 seconds, and then touch
them together again.
[Airplane Mode] is set to [On]. Set [Airplane Mode] to [Off].
Check whether the NFC function is activated on your smartphone. For details, refer to the
instruction manual of the smartphone.
Do not place any metal objects other than a smartphone near the (N mark).
Do not contact two or more smartphones to this product at the same time.
If another NFC-based application is running on your smartphone, terminate that
application.
[323] Troubleshooting Troubleshooting Computers
The computer does not recognize this product.
Set [USB Connection] to [Mass Storage].
Use the micro USB cable (supplied) to connect the devices.
Disconnect the USB cable, and connect it again firmly.