Mockups of sites with animation - what to prototype?

Question

Design

I'm looking for a software that can quickly sketch modern sites (including all conceivable and unimaginable animation), that is, I need flexibility. Now all sketches are on paper or prototypes are being made up. I know that it’s possible in Photoshop, but I’m not friends with him, and the tool is more for final solutions, and not hastily sketches.
Any advice, I'd be grateful

Answer 1

https://creative.adobe.com/products/animate
https://creative.adobe.com/products/reflow

Answer 2

www.axure.com - supports page transitions and animations within them