When units are being loaded to a transporter and unloaded from it it should be inverted.
Note that when an air unit dies the units are unloaded and stunned for some time.
When a sea transporter dies or an air transporter dies over water, they die, too.
There are also transporters for corpses which do not receive the stop order when being unloaded.
When units are being loaded to a transporter and unloaded from it it should be inverted. Note that when an air unit dies the units are unloaded and stunned for some time. When a sea transporter dies or an air transporter dies over water, they die, too.
There are also transporters for corpses which do not receive the stop order when being unloaded.
Unload events require a custom system: https://www.hiveworkshop.com/threads/transporters-system.329045/
If the implementation works, the cargo helicopters should be able to load/unload units in reverse.