Separate hiding a track from deleting its file
Selecting another subtitle for one viewing session is different from deleting an external subtitle from a library item. Plex’s mobile import and deletion guide documents both operations. Before using a delete gesture, identify whether you merely want the current session to use another track or genuinely intend to remove the external file from the server.
Read the administrator and format limits
Plex supports importing a saved subtitle through supported Android and iOS apps, uploading it to the server and selecting it for the item. Its deletion instructions apply to external subtitles, not subtitles embedded in the media. Deletion requires the server administrator and Allow media deletion enabled. Plex warns that the subtitle file is removed from the computer immediately, with app-specific confirmation or brief undo behaviour.
Use a reversible selection for an ordinary viewing choice
For example, a household member who prefers a different language should select the desired track rather than ask an administrator to erase the existing one. If an incorrect external file genuinely needs replacement, the administrator should identify and preserve the relevant original before removing it, then verify the new file on the intended media edition. Do not use deletion to test whether an embedded track will disappear, because the documented control does not do that. Keep server file operations distinct from an account preference, and report the subtitle source and exact item if the menu differs.
Questions, answered
Can this delete a subtitle embedded inside the video file?
Plex’s documented mobile deletion operation excludes embedded subtitles.