Persistence not working - Please help

Hi Guys

I'm hoping you can help me with my problem, it's my first time using Kali as I try to pursue an interest in security and penetration testing.

I've created a live USB Kali 2016.1 USB drive using the instructions from the Kali website. I've also tried to configure it with persistence using instructions from the site but this failed to work. So I began using different instructions from around the web but still with no joy.

When booting into Kali Live Persistence I see two USB icons on my desktop, Kali Live and Persistence (the name I gave the partition I created for persistence). Inside the Persistence icon there is the persistence.coif file that was create with / union inside.

I've tried saving to the desktop, root and documents but they're never there after a reboot. However when I save to the persistence icon/drive it remains after a reboot.

I've read several posts on here but none as helped me so far which is why I am posting, hopefully I've made a schoolboy error and you can point me in the right direction.

The commands I used were:

mkdir -p /mnt/my_usb
mount /dev/sdb3 /mnt/my_usb
echo "/ union" > /mnt/my_usb/persistence.conf
umount /dev/sdb3

Many thanks for taking the time to read and help in whatever way you can, Cheers

I can confirm that persistence is working for me following the kali docs site instructions. Without more information, it's hard to know where you went wrong.

I did the same as the Kali Linux instructions. The only thing different I did was use GParted to create the second partition for persistence and made it ext4 instead of ext3 like in the instructions.
Is there any other info you would like to kno? Thanks

Make sure that the persistence.conf file is owned by root, and that the partition is named persistence.

I had this problem after making a Live USB not as root (though could have also been this time I made it as non-encrypted). For some reason it did everything fine other then save the persistence.conf file.
I added it after and everything worked on next boot.
echo "/ union" > /media/root/persistence/persistence.conf