If an imags is used by a Flow post, that post's board appears in its "File use" section, e.g. https://www.mediawiki.org/wiki/File:OUYA-Console-set-h.jpg
Since boards are infinite and old tasks have to be paginated into view, it would be more useful if the link was to the topic and post that uses the image. For comparison, Special:WhatLinksHere follows the link to the Flow board with "(file link; from a post)" e.g. https://www.mediawiki.org/wiki/Special:WhatLinksHere/File:OUYA-Console-set-h.jpg
The workaround is to click Tools > What links here in the left-hand nav of an image's page.
Version: master
Severity: enhancement
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=65878