Open the Captions Editor

Five places it opens from. Pick the one nearest where you are

The Captions Editor is one window that runs in two modes. From the Library or the Inspector, it edits the saved transcript for a clip and writes back to disk. From a Mosaic, it edits the timeline's captions in memory until you export. Same editor, same tabs, same shortcuts. Only the save behavior differs.

The five entry points

1. Library, right-click a clip → "Edit Transcript…". Opens to that clip's saved transcript. Asset-keyed, saves on ⌘S.
2. Library, keyboard shortcut on a clip selection. Same result as the right-click. The shortcut is bindable in Settings, so check what yours is set to.
3. Paper Edit, double-click a row's segment text. The editor opens scrolled to the segment you clicked. Useful when a typo is staring at you from the script.
4. Mosaic workspace, "Edit Captions" button. Opens in in-memory mode against the Mosaic's current timeline. Nothing writes to disk until you export.
5. Inspector, "Edit Transcript" button. Pick a clip in the Library that has a transcript. Inspector on the right has the button.

Asset-keyed vs in-memory

This matters because the Save behavior is not the same in both modes.

Asset-keyed is everything except Mosaic. The transcript belongs to a specific clip on disk. ⌘S writes the changes back. Closing with unsaved edits prompts you to discard.

In-memory is Mosaic only. The captions belong to the Mosaic timeline, not to any single clip. They live in memory while the editor is open and travel with the timeline once you export. There's nothing to "save" mid-edit; you commit by exporting.

If the Mosaic timeline has changed since these captions were generated, an orange banner shows up at the top of the editor. Re-transcribe to regenerate, or Dismiss to keep the existing captions and accept the drift. We'll cover that in the export article.

Window layout

Top half is a player with a live caption overlay. Bottom half is four tabs: Captions, Style, Position, Animation. Switch with ⌘1 ⌘2 ⌘3 ⌘4. The divider between player and tabs is draggable. A status bar at the bottom shows segment count, word count, and an "edited" indicator when you have unsaved changes.

Open it once and the layout reads itself. The next four articles are what you do inside.