SUMMARY
I was trying to fix the broken image in https://techbase.kde.org/Template:Warning and I noticed that somehow https://techbase.kde.org/Template:Info has a working info image. This image's info page is https://techbase.kde.org/File:Dialog-information.png and it says it comes "from a shared repository", but the links to its details go to Wikimedia Commons and are broken. However, there is an identical-looking image on https://userbase.kde.org/File:Dialog-information.png

STEPS TO REPRODUCE
1.  Visit the URLs above

OBSERVED RESULT
The info page for File:Dialog-information.png  on techbase has a tab to [View on a shared repository], a tab to [Add local description], and text that says "This file is from a shared repository and may be used by other projects. Please see the _file description page_ for further information." But the links go to https://commons.wikimedia.org/wiki/File:Dialog-information.png where there's no such image.

I think the actual linked images are on userbase.

EXPECTED RESULT
It appears that techbase was configured to get images from a shared repository that is/was probably userbase.kde.org, but it's misconfigured, maybe after an update. The fix may be as simple as fixing the MediaWiki configuration so "the shared repository" is userbase.kde.org, not commons.wikimedia.org.

SOFTWARE/OS VERSIONS
n/a

ADDITIONAL INFORMATION
https://community.kde.org/File:Dialog-information.png is a different image and doesn't have this shared repository.
It would be useful to have a shared repository for cross-wiki images between userbase, techbase, _and_ community.