https://support.apple.com/en-mt/guide/motion/motn130ab64a/mac
Add, move, and delete Timeline markers in Motion - Apple Support (MT)
In Motion, add, move, and delete markers.
timeline markersapple supportaddmovedelete
https://developer.bitmovin.com/playback/docs/how-to-add-timeline-markers
How to add Timeline Markers
Overview Adding a marker to your playback timeline enables you to highlight specific positions (Chapters, Ad Breaks, special moments, etc) in your content to...
how totimeline markersadd
https://helpx.adobe.com/ca/premiere-elements/using/clip-timeline-markers.html
Working with clip and timeline markers
Learn how to work with timeline markers in Adobe Premiere Elements.
working withtimeline markersclip