Raid z-3 Adding new hard drives

good morning, I would like to know if I buy a NAS model TVS-h1688X, and I have 8 HD mounted in raid z-3, if I wanted to increase with new disks can I add just one at a time? thanks

Why 3 paritiy drives ? RaidZ 2 with two drives parity should be just fine.

But yes, you can add drives later

QNAP calls this RAID-TP
https://docs.qnap.com/operating-system/quts-hero/5.0.x/en-us/raid-types-E31ADD02.html

Could you please elaborate on your expansion plan? For example, you mentioned starting with 8 drives, correct? What is your desired final number of drives? Are you looking to expand one drive at a time, or do you have another strategy in mind?

Understanding your exact plan will greatly help us provide more tailored advice.