The Lenovo Flex 5 looks like a normal mid-range convertible, right? well, if you dig deep enough, you will see some cool features that are not necessarily inherent to 14-inch 2-in-1s. Also, the access to the hardware is pretty easy.

1. Removing the bottom plate

To detach the bottom piece, you will just have to remove all the screws around the bottom and then gently pry it up. This will give you access to all of the internals.

2. Storage

This small chassis holds the usual M.2 SSD slot and another 2.5-inch drive bay. Our unit, in particular, came only with an M.2 PCIe NVMe SSD from Intel with 256GB capacity leaving the 2.5-inch HDD/SSD slot free for upgrade. Usually, 14-inch convertibles don’t have the 2.5-inch bay so this is a big bonus to consider.
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https://laptopmedia.com/highlights/inside-lenovo-yoga-520-flex-5-disassembly-internal-photos-and-upgrade-options/