Deleted windows drives, cannot write to new partitions on drive

Evening all, for a few weeks I have been tackling this issue as a non newbie newbie, I have some idea of what the commands are doing etc, I use internet search to remember my commands etc, however my issue!!

I used to have dual boot Nobara SteamOS which is of course fedora 42 using KDE plasma,

I deleted the windows dual boot and now I have been running purely linux for 6+ months, I am in need of the 3tb (1 x 2TB SSD and 1 x 1Tb SSD) for Linux, I have used Gparted and deleted the NTFS partition, created a new partition with btrfs on the one drive for the moment, but for love of money I cannot install copy or write anything to the drive..

I have tried chmod etc, as its not ext4 so do not need to add uid or gid to fstab, but i cannot do ot, I used the DISKS app and then edit mount point options which has now added the gid uid to the file, but I cannot use it as a drive in my Steam library

here is my fstab

UUID=C3E0-444B /boot/efi vfat umask=0077 0 2
UUID=6b5b9496-9d8c-455e-9134-2e5b40bcd83c /boot ext4 defaults 0 2
UUID=f59e34af-1f7d-44b0-8267-d7f0d894f219 / btrfs subvol=/@,compress=zstd:1,x-systemd.device-timeout=0 0 0
UUID=f59e34af-1f7d-44b0-8267-d7f0d894f219 /home btrfs subvol=/@home,compress=zstd:1,x-systemd.device-timeout=0 0 0
UUID=824549b9-3f5f-4c01-80c9-89574c21f06d swap swap defaults 0 0
tmpfs /tmp tmpfs noatime,mode=1777 0 0

UUID=29a94b4a-ac00-4497-910a-165bc1c80501 /Storage btrfs defaults 0 0

the drive in question is labelled /Storage

I am getting to the point I truly think it will be easier to just start fresh but in reality I should not have to as I have done everything I think that needs to be done to create a second hard drive to use..

Any help is appreciated

Did you create a subvol on that drive?
Why did you not use the same defaults for the btrfs file system as was used for both / and /home?

Your fstab entries are definitely not default. The below is a default fedora fstab.

UUID=bf958d55-772f-4694-946c-9e29501aeb89 / btrfs subvol=root,compress=zstd:1 0 0
UUID=b8eac66b-a895-46df-838a-9a05aaa9f968 /boot ext4 defaults 1 2
UUID=B0D7-A0F5 /boot/efi vfat umask=0077,shortname=winnt 0 2
UUID=bf958d55-772f-4694-946c-9e29501aeb89 /home btrfs subvol=home,compress=zstd:1 0 0

For steam to use that drive it must have permissions and ownership that allows your user to access it.

THANKS for taking the time to reply!!

No subvol on the drive, steam created the fstab on installation I added the line to the fstab for /Storage

You think add a subvol and copy the lines from steam install just with relevant labels?

Btrfs can add space from a new driver to the pool used by the root and user subvols. See:
https://discussion.fedoraproject.org/t/how-add-more-space-in-a-btrfs-filesystem-how-add-a-new-partition-how-add-a-new-disk-linux/67595. There is a trade-off: you reduce the risk of issues if the system drive gets full but if either drive fails you lose everything. My experience has been that running drives near capacity leads to early failure. If you have backups, damage to a multi-drive pool should be survivable.