Can someone help me understand the different ways of connecting the controller in a simple list?

Here's how I understand it supposed to work:

• Steam button - connect to last connected device

• Hold Y + Steam button - turn off the controller or turn on in bluetooth pairing mode

• Hold B + Steam button - connect to a previously paired bluetooth device

• Hold A + Steam button - connect to a previously paired USB dongle

• Hold X + Steam button - pair with a new Steam link or USB dongle

• Steam + (Forward)Start - Swap between Bluetooth devices

My real world experience:

• Steam button - connect to Steam link even if the last connection was with the USB connector.

• Steam + Back - reset all connections and flashes the light on and off

• Steam + Forward(Start) - flashes the light on and off does not connect to anything.

To cycle between Steam Link and The USB connector am I supposed to hold the steam button first and then press the back button?

Does the pressing the steam button by itself actually connect to the last connected device?