Convert 2-drive mirror to 3-drive mirror?

I’m running Scale. I’ve found instructions for Core and many posts on the topic but I can’t seem to find anything up to date.

In Storage, there is an Add To Pool button which allows to add a drive to an Existing Pool. Is this the way? I want to move this 2-way mirror to a 3-way mirror.

Thanks!

You select your VDEV and then choose Extend and choose the third disk

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You want to extend the vdev. if you add a drive you have a mirror+ a single drive.
It’s under storage → view vdev → then there will be two buttons extend and remove

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