Edit: Sorry but I am not a linux “expert” and not great with fedora in general, usually on debian/ubuntu distros. But I think I see what the issues seem to be.
So I am assuming you have /run/media/root/fedora-expanded/images and /run/media/root/fedora-expanded/images/dev?
Have you tried this article https://wiki.fogproject.org/wiki/index.php?title=Adding_Storage_to_a_FOG_Server?
If you want all of your images moved to this new spot and not have the original location it maybe best to set it up like this and make sure the mount points are /images and /images/dev otherwise you need to make many more changes to make everything work. It sounds like just changing your mount point would be easiest and best now that everything is moved to your new drive.
That did the trick.