The timeline can only include a single photo track. However, it can include multiple audio tracks and multiple title/graphic tracks. The area along the left of the timeline is the track list and can be used to edit and reorder the tracks.
To use the track list
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Choose
→ or → . -
Control-click in the track list to add audio or title/graphic tracks.
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Click on the track boxes in the track list to select them.
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Delete tracks in the track list by selecting them and pressing Delete.
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Drag and drop selected tracks to reorder them or move them to different documents.
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Cut and paste selected tracks.