Can I upgrade my MacBook Air storage at the Genius Bar?

mfstjohn wrote:

Is it possible to have a genius bar install more storage in my macbook air from 2020? I have 256 GB and desire 512 GB.

Get an external drive and offload some of your data to the external drive.

And here are some good tips for freeing up storage space: Free up storage space on Mac - Apple Support

I believe that Apple started soldering in SSDs on all MacBook Airs, starting in 2018. You have a 2020 MacBook Air, so the SSD is soldered in, and there is no practical way to upgrade it.