State what the rescan should change
For rescan-external-files, the documented keep-selection mode preserves current tracks; the default reselect mode chooses preferred audio and subtitles again. Decide whether the task is to discover a newly saved file while keeping the current audition, or to move to a different default.
Record the selected narration first
Before the rescan, note the track identity and revision. Afterward, compare the available tracks and the one actually selected. If the sound changes, inspect selection before concluding that the narration file itself was overwritten or that a timing correction failed.
For a local production review, this distinction matters when several authorised revisions coexist. A new file becoming visible is useful; an unexpected switch during a presentation is a separate outcome that should be rehearsed beforehand.
Keep the action explicit
Document the rescan mode used and whether the track remained or changed. Do not describe all rescans as harmless refreshes. A clear selection policy helps a controller or operator preserve the intended audio through repeated review cycles.
Questions answered
Does discovering a new sidecar necessarily leave playback unchanged?
Not with every mode. Review the documented selection behaviour and verify the active track.
Can an unexpected voice track be a selection issue?
Yes. Compare track identity before assuming source-file corruption.
Sources & further reading
Official references for the subjects discussed. Service terms and device software can change.