Video

Draw your animation as a compilation of png files

Bring the exported files into Adobe Illustrator or analogous programs

After spreading them out evenly on the artboard, export it as png with a transparent background

Bring it into Unity engine change the Texture Type to Sprite (2D) and Sprite Mode to Multiple

Open Sprite Editor (if you don’t have it installed go to package manager and install under in-project) make grid by cell size (this depends on the size of your files) Slice and click apply

Now you have all the files to create the animation

Add the first frame png into the scene and scale it accordingly

Add an Animator component