So I have a fleet with a support group in tow including colliers, supply ships and tankers. Refueling is fine since you just tell the fleet to refuel from stationary tankers. However I don't know how to resupply from colliers. I give the join and add ordinance to fleet order and they join but don't add anything - they have the transfer system, are marked as colliers and have ammunition that the military ships templates are set to accept. Similar issue with supply ships. And I have tried passing time since its not instantaneous - nothing.
How to you resupply MSP and ammo?