Canon EOS R3 Advanced User's Manual page 811

4.
Pair the devices.
When the [Pairing] screen appears, press and hold the <W> and <T>
buttons on the BR-E1 simultaneously for at least 3 sec.
After a message confirms that the camera is paired with the BR-E1,
press <
5.
Set up the camera for remote shooting.
When shooting still photos, select [
For movie recording, set [
For instructions after the pairing is complete, refer to the BR-E1's
Instruction Manual.
Caution
Bluetooth connections consume battery power even after the camera's auto power
off is activated.
Note
When you will not use Bluetooth, setting this function to [Disable] in step 2 is
recommended.
>.
: Remote control] to [Enable].
811
] or [ ] as the drive mode ( ).