[Solved] Unable to move Dropbox folder

Linux spike 4.4.74-desktop-1.mga5 #1 SMP Mon Jun 26 07:50:58 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
[root@spike opt]# rpm -qa |grep kfilebox
kfilebox-0.4.9-5.mga5
[root@spike opt]# rpm -qa |grep dropbox
dropbox-servicemenu-0.16.1-3.mga5
dropbox-bin-1.6.2-3.mga5.nonfree
caja-dropbox-1.8.0-3.mga5.nonfree
Forgive me if this is not the correct place for this question.
A few weeks ago I posted a question about Dropbox not working. That issue was easily resolved, but now I've seen another issue with Dropbox (or Kfilebox as the case may be).
What's happening is that I am unable to move the default Dropbox folder. The persistent default location is /home/<user>/Dropbox. I'm short on space in that partition, so I'm trying to move Dropbox to a different partition on the same device.
What I am doing is:
Right-clicking on the dropbox icon in they tray
Stop dropbox
Right-click preferences
Under the Account tab enter the new location of the Dropbox folder (/mnt/backup/Dropbox)
Click okay
Rename /home/<user>/Dropbox to /home/<user>/Dropbox.old
Right-click preferences and start Dropbox
At this point, I get an error box:

Exiting stops the whole process.
Clicking Relink just recreates and syncs the folder under /home/<user>/Dropbox.
Any ideas?
Thanks.
Mark
[root@spike opt]# rpm -qa |grep kfilebox
kfilebox-0.4.9-5.mga5
[root@spike opt]# rpm -qa |grep dropbox
dropbox-servicemenu-0.16.1-3.mga5
dropbox-bin-1.6.2-3.mga5.nonfree
caja-dropbox-1.8.0-3.mga5.nonfree
Forgive me if this is not the correct place for this question.
A few weeks ago I posted a question about Dropbox not working. That issue was easily resolved, but now I've seen another issue with Dropbox (or Kfilebox as the case may be).
What's happening is that I am unable to move the default Dropbox folder. The persistent default location is /home/<user>/Dropbox. I'm short on space in that partition, so I'm trying to move Dropbox to a different partition on the same device.
What I am doing is:
Right-clicking on the dropbox icon in they tray
Stop dropbox
Right-click preferences
Under the Account tab enter the new location of the Dropbox folder (/mnt/backup/Dropbox)
Click okay
Rename /home/<user>/Dropbox to /home/<user>/Dropbox.old
Right-click preferences and start Dropbox
At this point, I get an error box:

Exiting stops the whole process.
Clicking Relink just recreates and syncs the folder under /home/<user>/Dropbox.
Any ideas?
Thanks.
Mark