All key and range bar positions changed, while Snap Frames is on, will be forced to absolute frame increments. This includes selection sets of multiple keys. When Snap Frames is on, each key in a selection set will snap to the nearest frame when the selection is moved or scaled.
When using the Time Display Format of MM:SS:Ticks (which does not use frames), Snap Frames snaps to time values that match frame boundaries.
Snap Frames: Forces keys to single frame increments.
With Snap Frames on, each key in a selection set snaps to the nearest frame when the selection is moved or scaled.