I installed and activated the theme Quasi Deepin Dark. However, it was not working properly so I rebooted. After rebooting, many icons went missing.
I checked the KDE Store, which says theme 'Quasi Deepin Dark' automatically installs Deepin Icons Collection. I checked system settings and found it installed and activated. However, it seems not working. What files are needed to show where the problem is?
I found that Add-On Installer says the add-on is installed, but it doesn't show up in the Icon Theme list like shown in the image.
I found that the default version of Deepin Icons Collection is not working(at least for this version of Plasma). I will upgrade to testing and try again.
Any idea would be much appreciated. Thanks.