Currently the only way to prevent Plex from automatically changing artwork is to keep the files local.
However, it is a very tedious and time-consuming process to store files locally. It would be easier if you had an option to have Plex automatically store the files locally. Any changes made via the GUI could then cause local files to be overwritten.
There’s an existing feature suggestion discussing an option to backup/store selected posters / backdrops etc. alongside your media. I suggest you comment/vote in that thread in order to avoid distracting or cannibalizing votes.
Unless I’m missing some unique aspect of your suggestion I’ll close this thread as a duplicate.
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Please close this one ![]()
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2022 clean-up: duplicate