I, too, am in this boat. Separate libraries for sharing 1080p movies with friends causes duplicates in the Continue Watching section from my 4K library. I tried following the recommendation here (Continue watching bug? - Duplicate playback of same movies but different versions) to no avail. I’ve been seeing from Plex Ninjas and moderators that this is a “feature not a bug” and that Plex sees the files as the “same”. What is it that Plex is reading that dictates the files are the same? Anything other than face value information (title, actors, description) would reveal they aren’t the same (resolution, runtime, file size, file location etc.) Plex has to store the playback information somewhere which means that it is accessing the file, would it have not been possible to implement a way to distinguish a file off of resolution or size or length as well as metadata to make the system more robust and comprehensive? Before when there was file merging and 4K was not as prevalent, this makes perfect sense but with internet speeds at what they are and the availability of UHD movies, I’m really struggling to keep up with the justifications of not differentiating between two different versions of movies.
