A question about dropping paratroops in MAP

[JasonHanLZ]

Hello everyone, I have a question about dropping paratroopers in the modern air power.I am playing the second scenario of War over middleEast called "Operation Kadesh" and I need to drop paratroops into Mitla Pass.

According to the manual and database, paratroopers are air droppable cargo and I can "attack" a friendly location to drop them.
However, I tried to right click the location or "shift + right click" and press "attack", and I even tried to land there, none of these methods worked. So can someone tell me how to drop off these paratroops ? Thank you.

I also attach the game file in this post.