See this answer is tricky.
I found the app two years ago on my IPad just looking for an animation app. Back then I didn’t really animate. It was like multiple images.
In the first one the characters would be at one position, in the next
One would be on the ground and the other would be still standing.
I quit using it because my IPad broke.
Then last summer I was at a friends house and I was bored so I was scrolling through apps I had before and I found SN.
I downloaded it and opened it up and here we are.