What strategies do you recommend for integrating interactive Lottie animations that respond to user input or scroll behavior on websites?

When creating animations for Lottie, follow these strategies to ensure compatibility and smooth performance:

Use Shape Layers: Convert all assets (text, vector elements) into shape layers to avoid rasterization issues.

Simplify Shapes: Avoid complex paths and keep shapes clean to reduce file size and rendering time.

Minimize Effects: Stick to supported effects like opacity, scale, and position. Avoid unsupported ones like layer styles and 3D effects.

Precomps: Use precompositions sparingly; flatten elements whenever possible.

Optimize Keyframes: Reduce unnecessary keyframes for smoother playback.

To Perform Complex Interactions with the elements of your Desired Lottie Animation, there are some key points to Consider:

1) Always Add the Class or ID as The name of the Layer or element you want to access Later on DOM loaded.

Like Layer name ( shape1 --> as (#shape1 or .shape1 ) !Very Important

2) The Above Point is Important ( for Hover and Click Interactions ). To perform any action for that Hover or Click, you can Either use Segments frames to play ( which you will set into the composition using Markers ) or you can use the Lottie Interactivity Guide to add Actions with Relevant Modes and Parameters to perform specific section of the composition.

3) As you asked for the scroll Interaction: Points to consider would be : 

Always use the Full auto Width or height either you want Horizontal or vertical Scroll.

You can mark the segments frames you want to play on scroll in the Code section ( HTML ) by accessing the lottie elment in DOM or use Lottie interactivity JS.

Always Tweak with the Speed or Duration parameter to get More Unique and Smooth flow for the Scroll Interaction for the Lottie ( for the play and stop point ).

I hope this helps.

Regards

Meer

Lottie and interactivity is not the best decision.
Rive - it is like Lotiie with interactivity under the hood as a basic version.
IMHO, it (Rive) has much more easy features to implement and control interactivity compare with Lottie

This can be done using Lottie SDK for web or app development environments. 

For example you are using Webflow, it'll have a Lottie plugin, once enabled you can use it to customize the animation behavior and interactivity and control each frame as you want it to be. It could be on scroll, hover, or click. 

For other apps or external dev environments, you'll need an SDK to be integrated. For example for Flutter, you'll need a Flutter SDK to access interactivity or even show the Lottie within your app.