Neptune Pine SD card upgrade

Neptune Pine smartwatch is currently offered with 16 or 32GB "capacity", which refers to pre-installed SD memory card size. The card is not accessible by user, at least not without disassembly of the unit (which voids warranty). This video shows how to operate the latch under which the card is mounted. I swapped the default 16GB card (class 4) with 64GB SanDisk Ultra, which Pine was able to format through OS utility.