This is a follow up to the following:
- Bug 27069 - Define $wgUploadNavigationUrl for ptwikibooks
I noticed that the links to missing files still do not point to Commons, and I didn't find any message (on [[Special:AllMessages]]) which I could use locally to point these uploads to Commons. Then I found
- Bug 18885 - Red links for media files do not support shared repositories
which was fixed by introduction of the [[mw:$wgUploadMissingFileUrl]] variable (see r69997).
So, could you set that variable to point the red links of our files to Commons? If I understood correctly, it is enough to copy the same url which is in use at