Hi,
On page 16 in the doc below you can see the steps to open the machine to get access to the RAM and SSD slots.
http://h10032.www1.hp.com/ctg/Manual/c06615724.pdf
It supports 32GB of RAM DDR4 2666MHz and there is no limit to the capacity of the M2 PCIe NVMe SSD.
Hope it helps,
David
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