PfSense on PROXMOX with VLANs?

[Nikole]

I am new to proxmox and Pfsense but I have managed to add a /28 subnet, and install Pfsense on KVM relatively "easy".

One of the IPs of the subnet is assigned on a Proxmox bridge and (vmbr1) works ok.
On proxmox I also have the following bridge (with no IP):

–
auto vmbr3
iface vmbr3 inet manual
    bridge_ports none
    bridge_stp off
    bridge_fd 0

The proxmox kvm has 2 NICs, one connected to vmbr1 (as WAN) and the other to vmbr3 (as LAN, 192.168.0.1)

If I create another KVM, and connect it to vmbr3 then I have a happily working KVM behind the Pfsense.

What I want to achieve however (and I can't!) is to create VLANs behind Pfsense.
My problem is not creating the VLANs inside Pfsense but on how to connect the different kvms on those VLANs!

I have followed this tutorial up to the point that the author makes changes on the switch :
Youtube Video

Pfsense shows WAN, LAN, VLAN1 and VLAN2.
The mystery is how to attach KVMs on VLAN1 & VLAN2!!!

I am assuming here that something needs to be done on the proxmox network and can't figure what (and possibly how) as I exhausted my knowledge!

Can someone please heeeeelp?  :'(

Nikole