ReadyNAS NVX Not Expanding Storage

I inherited this from the company I work at, and it's been working flawlessly as storage for my home Plex server (couldn't ever get plex plugin to work on the NAS (I guess one issue at a time), so it's just using shares with plex app installed on my home computer, pointed to the share)

However, time came for me to upgrade the disk space, as it came with 4x 1tb drives totalling 2759 GB of usable space.

I installed a brand new 3tb hard drive, and it scanned and everything completed, RAIDar is showing all is healthy -- however, the usable space hasn't changed, despite RAIDar and Frontview both seeing the 3tb drive installed and healthy.

In FrontView, I can see all of the disks and they are as follows:

Raid Level X-RAID2, 4 disks, Redundant

Ch 1: 931 GB (927GB allocated)

Ch 2: 931 GB (927GB allocated)

Ch 3: 931 GB (927GB allocated)

Ch 4: 2794 GB (927GB allocated)

I've restarted for 10 minutes, I've taken the disk out and back in so it rebuilt, I've left it off for an entire night (approx 8~ hours) and still nothing. I forgot to mention, this is running RAIDiator 4.2.30

Thank you so much in advance for any light anyone can shed on this.