Can you add RAM to MacBook Air 2020?
On this Q&A page you can find out the answer on can you upgrade RAM on an Apple MacBook Air 2020?

Can you upgrade RAM on an Apple MacBook Air 2020?
No, you can’t! All models of Apple MacBook Air 2020 come with dual-channel soldered memory and there is no additional RAM slot for expansion. So make sure you purchase a MacBook Air model with the right amount of RAM (8GB or 16GB) for your workload.

Source: iFixit

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