Adding two discs to TS-664 that has 4 drives currently

I have a TS-664 with 4 20TB drives running raid 5. I have two additional 20TB drives that I would like to add. If I add them, will the NAS start using them, will I lose data and have to reload, and does raid 5 work with 6 discs? Please advise.

Storage pools or static volumes?
https://www.qnap.com/en/how-to/faq/article/how-to-expand-capacity-by-adding-a-drive

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Hello,

and this info

Why can’t my volume expand over 63.99TB of storage space? | QNAP