I'm not having the same problem. All the wallpaper previews show up fine in the personalization module.

Perhaps one of the fine developers could suggest how to fix the problem. I'd suggest reinstalling the "dde-workspace" and "deepin-artwork" packages.

Well that's weird. I setup my own wallpaper yesterday. Today after booting, my selected wallpaper was revert to the default one but all the miniatures in the selection section finally appeared. I could then select the proper one. Must have been a glitch of some sort.

Copy All your Pictures to " /usr/share/background " and of course, open that file with as root. Than reboot your system.