Thread:Project:Support desk/How can I made three wiki store and read image form same folder?/reply

Just looking over the documentation, it looks like you need to set $wgUseSharedUploads to true and then set $wgSharedTables, $wgUploadDirectory, $wgSharedUploadPath.

Instead of doing this, I would recommend redirecting all users to a single wiki when they want to upload an image and then using $wgForeignFileRepos so they can reference that wiki.