The milk stash is your stored breast milk, bag by bag. Milk gets in two ways: straight from a pump session (see Pump and feed at the same time), or added here.
Open the Stash tab
Tap Stash at the bottom. The top shows how much is stored and where. Use first lists what to use next, and By location lists every bag in each place.

Tap Add milk
Set the Amount, pick Bag, Bottle or Container, and where it is kept. Under Pumped, say when it was pumped, which is what its storage window counts from. Tap Add to stash.



