Need advice with transport gate

Hello!
I need some advice concerning transport gate in zoo.
I try build transport way (water/ground) through aviary, but I have problem. I cannot route the transport through the gate and at the same time I cannot set the gate to the transport route. I saw a similar route in the zoo in career mode and am trying to recreate it in my zoo. Screens attached
scr1.jpg

scr2.jpg
 
I think you first need to place the track, and then able to place the barrier?

Not sure though.
 
when you try and join the track to the gate is that where you are having issues

if it is when you try and place the track you should see an icon that looks like a jigsaw piece where you click on to join the track to the gate piece
Always place the gate first then try and join the track to it
 
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