You can't upgrade the SSD on any M-series MacBook Air.

No. Apple solders the storage to the logic board. There is no slot, no replaceable module. The max capacity is whatever you configured when you bought it — Apple doesn’t offer higher capacities after the fact, and third-party upgrades are basically impossible without microsoldering work that costs more than a new machine.

The M1, M2, and M3 MacBook Airs all have the same tragic story: the SSD is permanently attached. If you run out of space, your options are external drives, cloud storage, or buying a new laptop. So if you’re shopping for one, buy the storage you think you’ll need in three years, not today. You can’t change your mind later.