Quite a lot of storage options, and no memory upgrades.

1. Remove the bottom plate

Prior to getting inside of the machine, you need to undo 10 Torx-head screws. Then just pop the bottom panel with a plastic tool, and that’s it.

2. Battery

Interestingly, instead of the 56Wh unit, we saw on the 14-inch model, there is a 42Wh pack on this device.
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https://laptopmedia.com/highlights/inside-huawei-matebook-d-15-2020-disassembly-and-upgrade-options/