Markers define a time and duration on a photo or music.
You can apply photo effects to markers and control how the effect fades in and out. If the marker is placed on an audio item (music), any effects applied to the marker will be applied to the photo at the corresponding time in the timeline.
To add a marker to photos or audio
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Select the photo or audio item to which to add the marker.
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Choose
→ .
You can select markers, drag them around, and delete them too.