Press Insert to put matching supplies into nearby containers.
Quick Stack uses Insert by default and searches containers within 10 metres. It moves items into containers that already contain that item type and that you are allowed to access. Your first inventory row and equipped items stay with you; tombstones and active Recovery Chests are excluded. The shortcut can be changed in Sunshine Alley's keybind settings.
Quick Stack are executed by server and will not work on movable containers such as Carts and Ships.
Additional Slots and Items can be excluded from Quick Stack behavior.