I have an external disk of 3,7TB formatted with 1 partition that occupies the whole disk. I have stored many films and photos on that partition.
Now I want to be able to see those films and photos on my LG TV which only accepts FAT32 or NTFS USB devices. So I need to shrink the 3,7TB ext4 partition to say 2TB and create a 1,7TB NTFS or FAT32 partition so that my TV can access the files.
--> I don't have another external device of sufficient size to backup the data, delete partitions and create new ones. I need to do it all on this disk alone.
So I ran the following commands:
Trial 1:
sudo resize2fs /dev/sdc 2000G
(first asks to run sudo fdisk /dev/sdc so I did that)
But the disk utility in Ubuntu (gnome-disks) shows that the partition is still 3,7TB and
the resize option is greyed out:

Trial 2
I ran this command:
sudo parted /dev/sdc resizepart 1 2000G
With the same results as with trial 1.
Now, when I ask for the properties of the partition, it says 2TB:

At the request of mook765, here the output of sudo fdisk -l /dev/sdc
Disk /dev/sdc: 3,65 TiB, 4000752599040 bytes, 7813969920 sectors
Disk model: Elements 25A3
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Any ideas what I'm missing to see this partition as 2TB and have 1,7TB free?