Yes, I do not know why pkexec has to be manually configured to work with Nautilus but doesn't with everything else.
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The best file manager is Thunar for me.
One reason I am patiently waiting for Zorin Lite.
Using sudo is one of those things that is normally not a problem until it is. Permission problems do and have happened though rare it should be noted. Getting back on topic, as remember there is more to adding wallpapers to the root background folder than just adding the images.
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Must be a Gnome thing.
On Zorin OS Lite, just toss whatever images whereever you want to... In home folder, pictures folder...
Then open the wallpaper settings and point to the directory that contains the pictures you want to use as wallpapers and pick one.
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No, I have encountered users on Ubuntu forums that have and could not get into their own files.I was told by an experienced user 10 years ago that it was best to avoid using sudo for GUI applications. I first used gksudo which is now depreciated and other alternatives already noted in this thread.
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Dear Mongoose, perhaps I was to eager.
You can just copy them to /Home/.local/share/backgrounds.
and do the ALT + F2 + r thing to refresh the desktop.
No sudo privileges needed and no xml files to adjust, which I suggested in my previous message.
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Same here.
I still do not understand the logic behind the removal of this command.
@Aravisian do you have any idea?
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Gksudo had some security issues that while not major, had enough presence to nag the developers minds. The current PolicyKit we use now was preferred.
Gksudo was deprecated with PolicyKitExectuable replacing it - pkexec
I am going off memory and this may not be fully accurate. @swarfendor437 may know more than I do. I asked him at the time and he explained it to me.
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I've discovered that what must have been a system update on my Desktop install of Devuan 3.1.1. I had setup with a separate root password and to install stuff would have to su in the terminal. They now use pkexec in the background so when I launch synaptic I have to use my user password, not root. I suspect that there was/is an issue with sudo in general, not just gksudo. 
Much easier in KDE on Zorin - Right click, Configure Desktop | Wallpaper | Add image ... Pictures folder opens:
Alternatively, Get New Wallpapers ...
Then left mouse-click on desired wallpaper and click on Apply.
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I found in Zorin 16 gnome when I used my own images from the pictures, a folder named wallpapers was created in the pictures directory and I simply load them into background settings from there.
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Does not work on my Zorin 16 gnome. How did you do this?
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I opened a picture from my own collection and used the context menu to set as wallpaper. When I did that the wallpaper folder was automatically created and from there I can use add picture in background settings to use when I want.
Example: I just set the owl picture as wallpaper from my collection and it now appears in the wallpapers folder.
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Got it,
I know why I couldn't do this. I use Dolphin.
Yes your right, using the standard file manager from Zorin, it can be done.
Well there are more roads leading to backgrounds for change. Hope Mongoose, reads them.
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He is currently busy chasing after Umlaut
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Just installed Solus Plasma on my older Laptop so I'm learning my way around KDE . 
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I like the Budgie DE your using on Zorin. It has a very clean and sleek look. But I guess that's a different laptop/pc.
I'm on my desktop. Zorin 16 Gnome/Budgie. Budgie is gnome based , they play nice together. **budgie-desktop** not the Ubuntu DE or budgie-desktop-environment.
I have only tried KDE on Zorin but didn't like it.
Is that the reason why Budgie is working for you, because it is gnome based?
Yes, they also share the file same file manager I had to install the budgie extras and applets from synaptic. I just select the session I want to use during login.
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I use Nemo, about the only program I run with sudo on occasion (when I don't use the right click option). I have not experienced any issues. Every other app, for the most part, that requires root access, requests it. I would be cautious about this though. You don't want to run programs in sudo just to make them work correctly. If you must do this, remove the snap or flatpak version and find installation instructions using apt or .deb files.
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