Can't resize my exFAT partition

I have an exFAT partition that I can't resize, with GParted nor Ubuntu Disks.

Here is what I see with Disks

And GParted shows this warning when I display the information of this device:

Unable to read the contents of this file system!

Because of this some operations may be unavailable.

I tried running Gparted with sudo -i gparted, this does not change anything.

This device is not read-only, I can delete files if I want.

I tried running sudo ntfsfix /dev/sdb3 and here is the result:

Mounting volume... NTFS signature is missing.
FAILED
Attempting to correct errors... NTFS signature is missing.
FAILED
Failed to startup volume: Invalid argument
NTFS signature is missing.
Trying the alternate boot sector
Unrecoverable error
Volume is corrupt. You should run chkdsk.

(PS: I'm open to suggestion if there is a better file system to share files between Linux/Windows/MacOS)

Solution 1:

As pointed out in the comments, it's hard (impossible?) to resize an exFAT partition in Ubuntu.

I managed to resize my partition with the use of DiskGenius, as advised in these SuperUser answers: https://superuser.com/questions/511819/resize-exfat-hard-drive & https://superuser.com/questions/393132/shrink-exfat-partition