Description of your request or bug report:
In the product request Crosslinking between different media forms of the same title, we obtained the possibility to link together related pieces of media as can be seen on the pages of 日本三國 S1 | L34 and ハリー・ポッター シリーズ | L28-31. However, this is always on-demand and the vast majority of the titles on LearnNatively do not feature a “Related” section. Most users are probably not even aware such a feature exists.
What I suggest is to replace the “whitelist” approach currently in use by a “blacklist” approach: run a batch script on the whole site to crosslink between different media forms by title (or by title + author, although that may miss most cases in Japanese because the names are typically written in Japanese characters for the book but in roman letters for the video, so we would be back to a situation with very little links).
In the majority of cases, linking everything with an identical title will have the expected effect and the user would no longer need to copy-paste the title and search it in another category to find its adaptation. The few oddballs and mistakes can be reported by users.
Often enough, the desire to correct things online is stronger than the desire to contribute new things online, so I think the “blacklist” approach is more constructive.