I cracked open my Acer Chromebook Spin 13 to see if I could boost the internal storage. I can’t but some models can. Here’s the answer to “Can you upgrade SSD on a Chromebook?”
SSD
Why I’d buy the upgraded $479.99 Lenovo IdeaPad Flex 5 Chromebook over the $409 model
Is it worth getting an upgraded Lenovo IdeaPad Flex 5 Chromebook for $80 when all you’re adding is double the storage? Yes because the storage is much faster NVMe. Here’s how much faster it can be.
Reader question: Does the Pixelbook use eMMC or SSD storage? (Answer: It depends)
Although Google lists the storage type as SSD for all three Pixelbook models, only one has a true SSD. However, the speed of your network connection is likely more important than local data transfer rates.