Canon EOS REBEL T8i Advanced User's Manual page 511

Steps on the smartphone (2)
11.
Tap a Camera Connect function.
The Wi-Fi connection to a Bluetooth-compatible smartphone is now complete.
For how to terminate the Wi-Fi connection, see
Terminating the Wi-Fi connection will switch the camera to the Bluetooth connection.
To reconnect via Wi-Fi, start Camera Connect and tap the function you will use.
In iOS, tap [Join] when a message is displayed to confirm camera
connection.
For the Camera Connect functions, see
When a Wi-Fi connection is established, the screen for the selected
function will appear.
[ Wi-Fi on] is displayed on the camera.
The Bluetooth and Wi-Fi icons are lit on the main Camera Connect
screen.
Camera Connect
Terminating Wi-Fi
511
Functions.
Connections.