The db version is not related with it and you do not need to play in the editor.
The magazines and the container have to be in the same place, and they are not in a multi units AB like RAAF Amberley in this scenario. The container button is greyed out or will be useless.
So the first thing to do is to move the container to the ammo shelter where the munitions are located, and then you may fill it with weapons. Explained in this video.

- CT.gif (1.4 MiB) Viewed 274 times
After that you will have to create a cargo transfer mission to one AB in the North. Note that some of them are also multi unit, you may have to select the exact place where you want it. I selected one of the ammo bunkers where the munitions are at Scherger AB. Or it may end in the control tower, like in the video below, not sure they will work, so better to send them to the correct place.
Also the Globemasters are not prepared to transfer a container of this size at Amberley, I changed the loadout to cargo 72 tons, 4 h are needed, plus the cargo time.
After all these steps you may edit the mission settings, should be set this way with green text, no issues. Note the ticked "automatically unpack container".

- CT.png (58.66 KiB) Viewed 274 times
The Globemaster flying to destination with the container and 3 LRASMs.

- MT.gif (1.35 MiB) Viewed 274 times
And the magazine with 3 LRASMS more after the correct transfer to the ammo bunker.

- MA.png (9.97 KiB) Viewed 274 times
JFS737 wrote a cargo tutorial and shared it with us.
Also a tome, you may request it to him, I support the request
https://forums.matrixgames.com/viewtopi ... 4#p5269804