Hi:
Below is the link to the Crucial memory report for your notebook.
Memory RAM & SSD Upgrades | hp - compaq | pavilion 15-cs series | Pavilion 15-cs3153cl | Crucial.com
According to the report you can install as much as 2 x 32 GB of memory.
Unfortunately the service manual on your notebook's support page is out of date and only covers the specs on the older models.
HP Pavilion 15-cs3000 Laptop PC series Manuals | HP® Customer Support
However, I am willing to bet that your notebook does not have the hardware to add a 2.5" SSD.
You would need the additional parts listed in chapter 3, page 26 of the manual...Neither part is orderable from HP.
(3) Hard drive brackets L19469-001
(4) Hard drive cable L23889-001
You would be better off replacing the existing NVMe drive with one having a larger storage capacity.