A short clip stretched over a full song has to repeat. At each repeat the video snaps from the last frame back to the first, and you see the jolt. Loop Style is the setting that controls this.
The 3 choices
Standard. The clip plays as it is.
Loop. The clip repeats from the start each time. There is a cut at the repeat point.
Bounce. The clip plays forward, then backward, then forward again. It never cuts. The turnaround is eased, so the direction change reads as smooth rather than abrupt.
Where to find it
Loop Style appears in all 4 lyric video starting points:
Album Cover
Spotify Canvas
Custom Scene
Library
When to use Bounce
Bounce works best on motion that reads either way: a slow push in, drifting smoke, water, cloth, light moving across a surface.
It works less well on motion with a clear direction that would look wrong reversed: someone walking, a car passing, text animating on.
When Bounce is not available
Not every clip can be played in reverse. If one cannot, you get a plain loop plus a short message explaining why. Where Bounce cannot apply at all, the option is not shown.
If you used Bounce before and it looked wrong
Bounce existed earlier but did not always do what it said. In several places it quietly gave a plain loop with the jump still in it, and in Spotify Canvas the clip played through once and then froze until you refreshed the page. Both are fixed everywhere Bounce can be picked. If you have an old project that looked wrong, set Loop Style again and re-render.