A subtitle found through Plex search is not automatically another user’s subtitle choice
Plex stores on-demand subtitle search selections per user, with a specific removal rule when a different track is chosen.
The journal
The viewing journal — page 105
Practical reading about streaming, devices and the decisions behind a better prepared setup.
Deleting an external subtitle in Plex can remove a server file immediately
Plex limits subtitle-file deletion to an administrator with media deletion enabled and excludes embedded subtitles.
A Plex subtitle choice can turn an otherwise compatible video into a transcode
Plex says an unsupported subtitle can require burn-in even when the original audio, video and container are compatible.
Plex Auto Quality does not dynamically reduce a stream already playing at original quality
Plex documents automatic quality adjustment for converted playback, rather than every Direct Play or Direct Stream session.
Plex’s Transcoder quality preset does not govern hardware-accelerated streaming
Plex distinguishes its software-encoding quality presets from the separate hardware-acceleration feature.
Plex uses different temporary-directory settings for streaming and prepared downloads
Changing the streaming transcoder directory does not move background Download or Media Optimizer staging.