I uploaded one my photos of Arlington Reef that I intended to use on Wikipedia article [[Wikipedia:Arlington Reef]]. The photo file name on Commons is File:Arlington-Reef-2018-aerial-view-Luka-Peternel.jpg
However, the file is not found or recognized on Wikipedia (please see the article on Wikipedia). It seems to be a bug in the linking of the file between Commons and Wikipedia. I have tried to test it in other articles and there is the same problem.
Hi @Path-x21, thanks for taking the time to report this and welcome to Wikimedia Phabricator! For future reference, please follow https://www.mediawiki.org/wiki/How_to_report_a_bug and include clear steps to reproduce the problem plus links.
https://commons.wikimedia.org/wiki/File:Arlington-Reef-2018-aerial-view-Luka-Peternel.jpg exists.
https://en.wikipedia.org/wiki/Arlington_Reef also exists and all seems to be correct, syntax wise.
I guess this falls either into caching / sync, or into InstantCommons $wgForeignFileRepos.
Based on behavior (works on mediawiki.org, test.wikipedia, test2.wikipedia, but not elsewhere) I strongly suspect this is a duplicate of T253405. I think we're seeing reports of this mostly for recent files because it's mostly recently-uploaded files that people care about.