Help With a Painting-Like Video Effect

I'm using: Procreate

I've TRIED: Looking through multiple tutorials and trying to figure out how this effect is created, but I haven't been able to find anything that explains this specific technique.

I need help with: How to create this specific painting-like effect where the image starts as a sketch and the colors appear/fill in smoothly, as if someone is painting the image in real time. I'm mainly looking for guidance on the technique or what tools/features I should be using in Procreate or is there any alternative

Does anyone help me with this video effect? Looked for many tutorial but cant seem to find this how this painting like effect is being done