When using the event editor/audio warp/variaudio, snapping only snaps to straight 4th/8th/16th etc this makes quantising for triplet and dotted tempos a lot harder. Currently the only way to achieve this is using triplet or dotted snapping in the main project area, snapping the play bar to the required interval, scrolling to find it in the editor, and then snapping the warp marker to the play bar and do this for every beat.
Note: This is a copy paste from an old feature request going back to 2011 - here are some examples
Cubase 10 - https://www.steinberg.net/forums/viewtopic.php?f=285&t=154618&p=915399#p915399
Cubase 9 - https://www.steinberg.net/forums/viewtopic.php?f=252&t=172592&p=922555&hilit=triplet+snap+editor#p922555
Older Cubase Versions: https://www.steinberg.net/forums/viewtopic.php?f=146&t=6007&p=40227&hilit=triplet+snap+editor#p40227
Older Nuendo Versions: https://www.steinberg.net/forums/viewtopic.php?f=147&t=14486&p=92382&hilit=triplet+snap+editor#p92382