Trying to Reamp (PLS HELP!)

Hi all! Hopefully this is the correct subforum for my question :slight_smile:

I have been using Cubase for a few months and I love the software. However I recently tried to setup a guitar reamp session and just can’t get it to work.

I am using Cubase 9 pro and a Focusrite Saffire pro 40.

What I would like to do: my reamp box is connected to the output 4 of the Saffire. I want to play a guitar DI track, through the out 4, and run it through my amplifiers recorded in stereo with 2 microphones back into the front stereo input of the Saffire.

The full signal chain would be:
Cubase mono track > Saffire Out 4 > Reamp box > Pedalboard > 2 amps > 2 mics > Saffire In 1/2 > Cubase stereo track

I tried to set it up as I used to do it in Pro Tools (change the output in the routing tab) but apparently no signal comes out of the interface.

I searched online and most people seem to reamp using external send/return FX.
I tried to do this (vst connections - external FX - rename the output/input) but then I create a new FX track and in the drop menu there is no option to select external FX. I was following this video:

But the step where he sets up an FX track and opens the dropdown menu to select the external FX option, that option is not there in my computer. (2:55 in the video)

Am I missing something? I searched the steinberg forums and youtube and found no answer.
Maybe there is also another easier way to reamp than using send/return FX?
Sorry I am used to routing in Pro Tools so this is new for me.

Other hardware info:
Mac Pro 5.1 2011 (OSX 10.12)
Cubase Pro 9
Focusrite Saffire Pro 40 (Saffire mixcontrol software 3.7)
Radial Pro-Amp Reamp box

Thanks for your time!