Hi,
The notebook supports max 16GB of DDR3L 1600MHz RAM (2x8GB)
At the moment you have one 8GB module.
Example of RAM:
https://www.crucial.com/usa/en/compatible-upgrade-for/HP-Compaq/pavilion-15-p206tx#MEMORYFilters
On page 81 of service manual you can see the steps to install the RAM
http://h10032.www1.hp.com/ctg/Manual/c04511833
There is no M2 slot, however I recommend replacing the HDD with a 2.5" SATA3 SSD such as the 2.5" Samsung 860 Evo or similar. It will give a great boost to the everyday performance of the notebook (more than the extra RAM)
Example:
https://www.amazon.com/dp/B0781Z7Y3S/ref=twister_B07P5VF5TL?_encoding=UTF8&psc=1
You can then reinstall the OS on the SSD
https://www.microsoft.com/en-us/software-download/windows10
or clone the old drive to the new one.
Hope it helps,
David
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