Did you also capture enemy factories to produced enemy ammo???
Mod does not support resupply of any enemy vehicles.

I have plans with the next update to delete
- resupply of German weapons from Russian trucks
- resupply of Russian weapons from German trucks

That will prevent tactics of captiring vehicles in Conquest mode.

I haven't noticed getting an enemy factory might test it right now, however it did encourage me to do so since by playing the british, countering german heavy tanks is a hassle because of the massive aiming circle of the british QF-17 pounder gun at longer ranges

mod does not support supplying in battles indeed, even with captured factories

I have to add to this. if a capured weapon is mounted on a vehicle. for exaple a 50bmg on a hetzer the gun will glitches in the next mission and cause the game to crash if tried to fire

Uuugghh so this is why I can't resupply my mortars in my captured vehicles only playthrough