However, trying to enforce the "pool
fallback lookup" documented
we tried moving away the instance's own images/ directory. Doing this, all images
result into a broken link.
The instance still see the images as "local" at its image table in the
db. MediaWiki doesn't check that the file is still there at images/ folder.
Test it with a file which wasn't previously uploaded locally, then try
deleting entries from image table.
That's correct. Thanks!