unity-dotween-design

Use Sequence.Join instead of a second Append. Append places a tween after the previous one ends, while Join starts it at the same time as the last appended tween, producing parallel motion within one Sequence.

OnComplete does not fire on tweens with SetLoops(-1) because infinite loops never complete. Use OnStepComplete for per-iteration callbacks and OnKill for final cleanup when the tween is explicitly killed.

Prefer ToUniTask from the UniTask DOTween bridge. It is zero-allocation, supports CancellationToken via TweenCancelBehaviour, and is event-driven, whereas AsyncWaitForCompletion allocates a Task and polls every frame.

These errors mean the required DOTween Module was not generated. Open Tools, Demigiant, DOTween Utility Panel, enable the Physics, UI, or UnityVersion module, and click Apply to generate the module files.

Call SetLink(gameObject, LinkBehaviour.KillOnDestroy) on the tween so its lifetime binds to the GameObject. Without SetLink, Safe Mode catches the missing-reference exception and kills the tween silently, hiding real lifecycle bugs.

Image.DOFade changes only that Image's color alpha, while CanvasGroup.DOFade changes the CanvasGroup alpha affecting all child UI elements. Choose based on whether you need to fade a single widget or an entire panel.