What's the best Android app for creating frame-by-frame or keyframe animations?

Alight Motion is a robust mobile application built for creating vector and raster animations through a detailed keyframe system. For users seeking to produce frame-by-frame animations or smooth motion tweens, the app offers a granular timeline, bezier curve editors for precise movement control, and support for multiple layers. This allows for complex sequences where individual elements can be animated independently. A practical use case involves creating animated logos or short explainer videos directly on a phone, where each component's position, scale, and rotation can be manipulated across the timeline. However, reviews indicate a recurring issue where the export function can sometimes fail, displaying a black screen. This bug, reported as happening frequently, is a significant drawback for workflow reliability. Despite this, the app's depth—offering features like blend modes, visual effects, and audio syncing—often outweighs the instability for dedicated users. It's considered more powerful for animation than many mainstream social media editors, though its interface has a steeper learning curve noted in user feedback.