Transferring ammo

Transferring ammunition to and from storage boxes is a hassle. I play on ps4 and was wondering if anybody else had this issue. Dropping ammunition is fine, but trying to transfer it takes way too long. If the same mechanic as dropping ammo is added to transferring it, that would be great!

Hey @Cjsk922, welcome to the forums! Are you talking about changing the total in increments of 10 by pressing up/down on the D-Pad or Left Stick? That works when both dropping and transferring.