So I'm fairly new to all of this and may need some clarification. I have a F2-223 that I've been using for about a year with a 6TB drive installed it using TRAID. Recently, I've installed a new 10TB drive thinking it would give partial redundancy space as well as expand the current storage pool. Now, after fiddling with it for a while, I realize that I either misunderstood how TRAID worked to begin with or I'm doing something wrong.

Here's a screenshot of what I'm looking at. The drives are synced, but the option to edit/expand is grayed out (which is what tipped me off that I had misunderstood what was going on). Am I right in my assumption that expansion is not possible with the current setup? If so, what are the ways I could expand storage space in my current situation? Keeping the data on the current volume is important to me, so I could see about investing in a NAS with more drive bays if it comes down to it.
Thanks for any insight!

