Full Guide to Upgrade SSD on HP Pavilion x360 – No Data Loss
Amazon.com: Newest HP Pavilion x360 14" HD WLED Touchscreen 2-in-1 Convertible Laptop, Intel Core i3-8130U up to 3.4GHz, 8GB DDR4, 128GB SSD, 802.11ac, Bluetooth, USB-C, HDMI, HP Active Stylus Pen, Windows 10 :
HP Pavilion x360 14m-ba011dx SSD Replacement - iFixit Repair Guide
Add second HDD/SSD to Pavilion x360 - HP Support Community - 7049298