@silfredov Welcome to the Wyze community! You will need to buy a microSD card for each cam. See photos on how to install the cards in the cams.
For best performance, it’s recommended to use 32 GB High Endurance microSD cards with video cams.
https://www.amazon.com/dp/B07B98GXQT/ref=cm_sw_r_cp_tau_Pxc4Eb9AAN372